Political-Choice Compression and Anti-System Sentiment in the United States

Executive conclusion

The hypothesis is partly supported, but its strongest form is not.

There is strong evidence that U.S. electoral institutions systematically compress a much broader distribution of political preferences into a smaller set of viable choices, usually two at the decisive stage of an election. Single-member districts, plurality or plurality-like winner-take-all rules, strategic voting, strategic candidate entry, spoiler risks, and ballot-access rules all contribute. Comparative evidence strongly supports the general Duvergerian proposition that single-member plurality elections tend toward two-candidate or two-party competition, although the tendency is probabilistic rather than absolute. In a study of 6,745 single-member-district contests in 53 democracies, Matthew Singer found that the two leading parties usually captured more than 90% of the vote under plurality, while also showing important exceptions driven by ethnic geography and the wider national electoral system. Clark and Golder likewise found that appropriately specified cross-national tests largely support Duverger's expectations. ^{source ref}

There is also unusually direct recent evidence for the psychological coordination mechanism proposed in the question. In Gallup's September 2025 surveys, 62% of Americans said the two major parties were doing such a poor job that a third party was needed, yet only 15% said they were very likely to vote for a third-party or independent candidate. When respondents were told that the third-party candidate they regarded as best had little chance of winning according to polls, news reports or experts, 54% said they would switch to a Democrat or Republican. Fifty-seven percent were extremely or very worried that a third-party vote would be wasted, and 59% were similarly worried it could help elect their least-preferred candidate. ^{source ref}

That is strong evidence for a distinction central to this inquiry:

The most defensible description is therefore “choice compression,” not “no choice” or necessarily “false choice.” The Democratic and Republican parties are not interchangeable. Research depicts them as large, internally heterogeneous coalitions with distinct policy-demanding groups, activists and agendas, while the rise of negative partisanship shows that many voters perceive the opposing coalition as highly consequential. ^{source ref} Two-party organization can move coalition-building inside parties, before the general election, rather than eliminate coalition bargaining altogether.

The critical weakness in the hypothesis comes later in the causal chain. There is credible evidence that poor representational fit and lack of a viable congruent choice can reduce satisfaction with democracy and probably contribute to political alienation and low external efficacy. Cross-national work finds that satisfaction is higher when citizens have an ideologically congruent party that also has a realistic chance of influencing government; merely having a congenial but politically irrelevant party does not have the same effect. Other research finds that closer party-voter policy congruence predicts higher democratic satisfaction. ^{source ref}

But the evidence becomes much weaker when the outcome is raised from dissatisfaction or alienation to rejection of democratic institutions, constitutional replacement, or revolutionary sentiment. Large numbers of Americans want major political-system change: Pew found in 2025 that roughly eight-in-ten or more Americans said their political system needed major changes or complete reform. Yet that question does not establish that respondents reject democracy, attribute the problem to two-party electoral rules, or favor revolutionary replacement of the constitutional order. Pew also found strong connections between reform demand and evaluations of elected officials, suggesting multiple routes into system dissatisfaction. ^{source ref}

Most importantly, I found no strong body of U.S. causal research demonstrating that perceived two-party choice restriction is a major independent cause of revolutionary attitudes. Studies of support for political violence instead repeatedly identify partisan hostility, racial or ethnic threat, resentment, political mistrust and related identity-based grievances as important predictors. ^{source ref} This does not prove that constrained choice is irrelevant. It means the decisive final link in the hypothesis has not been empirically established.

Overall hypothesis test: U.S. electoral institutions very likely compress political choice; many voters recognize and strategically respond to that compression; perceived lack of meaningful representation plausibly contributes to alienation and demand for reform. The evidence does not justify describing it, at present, as a demonstrated “major source” of revolutionary sentiment. That stronger claim would require individual-level longitudinal, experimental, or quasi-experimental evidence showing that perceived rule-induced representational exclusion causes support for regime replacement or political violence after accounting for partisanship, ideology, economic conditions, identity threat, trust, authoritarianism and incumbent performance. The existing literature does not provide that demonstration.

Causal model of political-choice compression

The core mechanism is best divided into an institutional stage, a coordination stage, and a legitimacy stage. The evidence is much stronger for the first two than for the third.

Underlying preference diversity → candidate/party entry → electoral rules → perceived viability → strategic voting → observed vote shares → elite/resource responses → future perceived viability → representation/efficacy judgments → system attitudes.

The central institutional mechanism is not that third parties are legally impossible. It is that winner-take-all rules change the expected payoff from supporting them. In a single-member plurality contest, the second-place finisher receives no representation from the district, and the third-place finisher receives no more representation than the fourth or fifth. This creates both a mechanical effect—votes are converted into seats discontinuously—and a psychological or strategic effect—voters and political elites have incentives to coordinate around contenders believed capable of finishing first. Burden summarizes the U.S. minor-party problem in precisely these terms: winner-take-all rules do not reward third-place finishers, while voters have reason to avoid wasting votes or producing spoiler outcomes. ^{source ref}

Duverger's Law should not be interpreted as a claim that every plurality election literally produces exactly two parties. Singer's 53-country analysis finds a strong two-party tendency but also persistent third parties and systematic deviations where ethnic divisions, regional concentration and the surrounding national party system allow them to survive. ^{source ref} Clark and Golder similarly argue that electoral institutions interact with social heterogeneity: social cleavages alone do not straightforwardly generate additional viable parties when electoral rules make coordination on them costly. ^{source ref}

There is an especially important challenge to a voter-centric version of the theory. Mark Fey demonstrates formally that Duvergerian two-candidate competition can arise even when voters cast sincere rather than strategic ballots: strategic candidate withdrawal and entry can itself produce two-candidate equilibria because poorly positioned candidates may prefer to withdraw and improve the prospects of a nearby alternative. Thus, finding two-party competition does not by itself prove widespread lesser-of-two-evils voting. ^{source ref}

The U.S. adds legal and organizational frictions. Ballot-access requirements vary across states, and research on ballot regulation treats petition requirements and related access rules as additional constraints on nonmajor-party candidate entry. Burden's work places these barriers on top of, rather than in place of, the more fundamental Duvergerian incentives of single-member districts. ^{source ref} Presidential elections add another layer: most states allocate their presidential electors to the statewide winner, while Maine and Nebraska use a district-based exception, reinforcing the importance of finishing first rather than accumulating a nationally proportional vote share. ^{source ref}

Evidence for the proposed feedback loop

The feedback model therefore survives empirical scrutiny in broad outline, but not every arrow is equally demonstrated. The voter-side loop—viability perception, waste/spoiler concern, strategic defection—is considerably better established than the donor/media recursion.

A useful complication is Burden's distinction between instrumental strategic voting and expressive strategic voting. In 2000, when the national contest was close, strategic defection harmed Nader in competitive states. In 1992 and 1996, when some voters perceived the major-party outcome as less locally consequential, minor candidates could instead gain expressive votes. ^{source ref} The implication is not “Americans always vote lesser of two evils.” It is that plurality creates an incentive whose strength varies with perceived closeness.

Spoiler effects are likewise real but should not be overstated. A third candidate need not draw exclusively from one major-party alternative; some supporters would otherwise abstain or support the other major party. The scientifically relevant question is the counterfactual distribution of those votes, not whether a minor candidate's raw vote total exceeds the winning margin. The 2000 Nader literature is valuable partly because it illustrates precisely this counterfactual problem.

Voter perceptions and psychological consequences

The clearest contemporary finding is a striking gap between demand for additional representation and willingness to act on it electorally. In September 2025, 62% of Americans told Gallup a third major party was needed because the existing two were doing a poor job; only 30% said the two parties adequately represented Americans. The desire for another party was especially high among independents, at 74%, but was also expressed by 58% of Democrats and 43% of Republicans. ^{source ref}

That attitude has persisted rather than appearing as a one-election anomaly. Gallup reported 63% favoring a third party in 2023, the highest reading in its series, and 58% in 2024; majority-level support has persisted for years. ^{source ref} Yet stated desire for another party plainly cannot be equated with an existing latent third-party majority. In 2025, only 15% were very likely to support such a candidate, and the subgroup both very likely to support one and willing to do so despite low winning chances represented only about 11% of adults. ^{source ref}

That distinction matters because several different attitudes are often collapsed under the label “false choice”:

The comparative literature provides an important bridge between the second and fourth rows—but not all the way to the fifth or sixth. Hobolt, Hoerner and Rodon's cross-national and experimental evidence indicates that citizens are more satisfied with democracy when they can support a policy-congruent party that has a realistic prospect of entering government. A congruent party without political instrumentality does not produce the same satisfaction benefit. ^{source ref} This finding closely matches the user's distinction between “a name on the ballot” and “a genuinely viable alternative.”

Ezrow and Xezonakis, examining 12 countries from 1976 to 2003, similarly find higher aggregate satisfaction when parties' policy positions are more proximate to citizens' preferences. ^{source ref} The combined implication is that democratic satisfaction depends not simply on the formal opportunity to vote but on the quality and consequentiality of the available party offer.

Evidence concerning external political efficacy points in the same general direction but is less specific to party systems. U.S. research on women's representation, for example, finds that perceptions of political inclusion can affect feelings that government is responsive to “people like me.” ^{source ref} That strengthens the plausibility of a representation → efficacy pathway, but it would be an overreach to treat descriptive representation research as proof that two-party compression causes low efficacy.

The evidence for several downstream outcomes should therefore be graded separately:

Political alienation and democratic dissatisfaction: Moderate-to-strong evidence that representational mismatch and nonviable preferred alternatives can contribute. The best evidence is comparative rather than uniquely American. ^{source ref}

Declining external efficacy: Plausible and supported by broader representation literature, but direct U.S. studies isolating the number or viability of party alternatives are much thinner. Research also shows that efficacy can be shaped by resentment and partisan context, demonstrating confounding pathways. ^{source ref}

Abstention: Low efficacy and alienation can plausibly discourage participation, while an unappealing choice set can make abstention rational for some voters. But the evidence gathered here does not establish that perceived two-party constraint is a large independent cause of U.S. nonvoting after socioeconomic resources, registration costs, political interest and competitiveness are controlled. Confidence in this specific causal link is low-to-moderate.

Independent identification: The relationship is real descriptively—independents are by far the group most likely in Gallup to say a third party is needed—but this does not show causal direction. People may become independent because neither party represents them, or people with weaker partisan attachment may simply be more open to additional parties. ^{source ref}

Support for political reform: Very strong at the broad level. Pew's 2025 cross-national survey placed the United States among countries where roughly eight-in-ten or more said the political system required major changes or complete reform. But “reform” can mean campaign finance, congressional rules, corruption, term limits, electoral methods, institutional ethics or many other things; it is not an electoral-system-specific measure. ^{source ref}

Fundamental constitutional change or system replacement: Evidence is much less diagnostic. Pew's “major changes or complete reform” wording indicates deep dissatisfaction but cannot tell us whether a respondent wants to abolish constitutional democracy, substantially amend it, change election rules within it, or simply improve government performance. Treating that answer as revolutionary sentiment would be a measurement error. ^{source ref}

Revolutionary attitudes or support for political violence: The hypothesized link is presently unproven. Contemporary U.S. violence research points toward partisan animosity, racial and xenophobic attitudes, resentment, threat perceptions and mistrust as important correlates. Piazza's study, for example, finds relationships between Trump approval, racist/xenophobic attitudes and approval of political violence; research on resentment likewise finds effects on external efficacy. Neither identifies lack of party alternatives as the central mechanism. ^{source ref}

This last distinction is the most important conclusion of the research. A person can believe “neither party represents me” and still strongly support constitutional democracy. A person can favor proportional representation or another electoral reform precisely because they want existing democratic institutions to work better. Reform orientation and regime-rejection therefore have to be measured separately.

Strongest counterevidence and alternative explanations

The strongest counterargument is not that electoral compression fails to occur. The institutional evidence for compression is too substantial for that. The stronger counterargument is that compression may constitute aggregation rather than deprivation of political choice.

American parties can be understood as pre-electoral coalitions. Bawn, Cohen, Karol, Masket, Noel and Zaller describe parties as coalitions of interest groups and activists that develop common agendas and screen candidates for nomination. Their evidence spans historical party formation, party shifts on civil rights and abortion, congressional polarization and nominations. ^{source ref} Under this interpretation, ideological blocs that might organize as separate parties under proportional representation instead negotiate within the Democratic or Republican coalition.

That means two labels on a general-election ballot can conceal considerably more than two political tendencies. Progressives, social democrats, liberals, moderates, libertarians, business conservatives, religious conservatives, populists and other factions may contest influence inside the two organizations rather than through separate general-election party labels. That is a substantive form of political pluralism, although one operating at a different institutional stage. The empirical dispute is therefore partly where coalition formation occurs—before the general election inside parties or afterward between multiple parliamentary parties—not simply whether coalitions exist. Bawn and colleagues support the importance of internal coalition politics while also warning that activist and organized-group influence can make parties less responsive to ordinary voters. ^{source ref}

Primaries are a genuine counterweight to the “artificially restricted” interpretation because voters can sometimes choose among competing factions before the final ballot. That gives citizens more influence than a model looking only at November's two candidates would imply. At the same time, primaries do not fully neutralize the compression argument. The party alternatives entering a primary are already shaped by recruitment, fundraising, endorsements, strategic candidate decisions and party networks, and polling in advance of the 2024 election found substantial public skepticism about the way the major parties choose leaders and whether nominees represent voters' views. ^{source ref}

The two major parties also are not reasonably described as a policy-identical “false choice.” Negative partisanship research finds that dislike of the opposing party has become an important force in American electoral behavior and nationalized party competition. ^{source ref} That can produce “vote against X” or “lesser-of-two-evils” voting, but it actually cuts both ways for the hypothesis. Negative voting may mean a voter feels poorly represented by their chosen party; alternatively, it may mean that the voter sees a very meaningful substantive difference between the two viable outcomes and votes instrumentally to block the one they strongly oppose.

This is why negative voting is not equivalent to false choice. A voter who says, “I am not enthusiastic about candidate A, but candidate B would enact policies I strongly oppose,” is exercising strategic choice between consequences they perceive as substantially different. By contrast, someone who says, “both viable parties exclude my position, but supporting my preferred third option could elect the major party I dislike most” fits the political-compression mechanism much more closely. Abramowitz and Webster's negative-partisanship findings make the former mechanism important enough that it cannot be ignored. ^{source ref}

Several other explanations compete with constrained choice as sources of anti-system sentiment.

Performance dissatisfaction is an obvious rival: economic conditions, inflation, wars, public services, immigration, crime, corruption or legislative gridlock can reduce confidence even when voters regard the electoral choice as meaningful. Pew's cross-national reform survey finds that demand for political-system change is associated with beliefs that elected officials are unethical, unqualified, inattentive or focused on the wrong problems. ^{source ref}

Winner-loser status is another. Anderson and Guillory found in 11 European democracies that electoral losers were less satisfied with democracy than winners; consensus-oriented institutions reduced the dissatisfaction of losers, while majoritarian systems increased satisfaction among winners. ^{source ref} This implies that some “system dissatisfaction” is endogenous to losing elections rather than to the number of available parties.

Partisan and identity conflict is a third. Research on negative partisanship shows that aversion to the opposing party can itself sustain participation and loyalty, while political-violence research finds strong connections to identity threat, xenophobia, racial attitudes and intense partisan conflict. ^{source ref} These mechanisms can generate very strong anti-system rhetoric even among citizens who emphatically prefer one of the two major parties.

Resentment and perceived status loss provide another pathway. Recent ANES-based work finds resentment associated with declines in external political efficacy, particularly among white respondents. ^{source ref} Low efficacy therefore cannot safely be attributed to electoral choice restriction without distinguishing the two mechanisms.

Polarization can itself increase perceived stakes. When voters think the opposing party poses a severe threat, the incentive to desert a low-probability third choice becomes stronger. In this sense polarization and choice compression may interact: ideological distance between the major parties can make the choice more substantively meaningful while simultaneously making experimentation with minor parties more strategically costly. Gallup's finding that 59% fear helping their least-preferred candidate is exactly consistent with that interaction. ^{source ref}

These counterarguments substantially weaken any interpretation in which Americans are simply presented with two indistinguishable options by an externally imposed duopoly. They do not overturn the narrower proposition that winner-take-all institutions suppress the electoral expression of some preferences that could sustain separate parties under other rules.

Comparative evidence from multiparty democracies

Comparative research strongly supports the proposition that electoral rules structure the effective party menu, but it also shows that simply maximizing the number of parties does not automatically maximize democratic satisfaction.

Singer's 53-country evidence is especially informative because it examines individual single-member-district contests rather than assuming national party counts tell the whole story. Plurality districts generally converge toward two dominant competitors, yet third parties can survive where support is geographically concentrated or where the broader political system sustains them. ^{source ref} This helps explain why Duverger's “law” is better understood as a strategic tendency than as a deterministic law of nature.

Clark and Golder's cross-national tests similarly support an interaction between electoral permissiveness and social diversity. A country can contain many ideological, ethnic or social cleavages without converting all of them into viable electoral parties if the electoral system penalizes fragmentation. ^{source ref} Thus the claim that “American voters only want two broad camps” cannot be inferred simply from observed Republican and Democratic vote shares, because those vote shares are themselves produced under institutions that reward coordination.

At the attitudinal level, Hobolt, Hoerner and Rodon provide some of the strongest evidence for the precise distinction posed in the question. What matters is not merely whether citizens can locate a party close to themselves ideologically. Satisfaction with democracy is higher when that congruent party is politically consequential—capable of entering government. ^{source ref} A five-party ballot on which one's preferred party is permanently irrelevant need not generate greater efficacy than a competitive two-party system. Viability is therefore empirically important in its own right.

Ezrow and Xezonakis likewise find that the ideological fit of the party offer matters to democratic satisfaction. ^{source ref} These results support the idea that political representation should be measured by preference-to-party congruence, not by ballot length.

Consensus institutions can also soften the psychological cost of losing. Anderson and Guillory found that electoral losers in more consensual systems were more satisfied with democracy than losers in majoritarian systems, although winners showed the opposite pattern: they were particularly satisfied under majoritarian arrangements. ^{source ref} That is important counterevidence to a simplistic proposition that proportional or multiparty democracy makes everyone more satisfied. Institutions redistribute whose preferences are represented and how directly, rather than producing an unambiguous universal gain.

Multiparty systems also retain strategic voting. Electoral thresholds can make a vote for a very small party risky; voters may choose among coalition-compatible parties strategically; and government coalitions are often negotiated after ballots are cast. The tradeoff is consequently not “strategy versus sincere voting” but where and how strategic coordination takes place.

A useful comparative synthesis is:

Majoritarian two-party systems: fewer viable final-stage alternatives, clearer responsibility for government, more pre-electoral coalition formation, potentially larger winner-loser gaps.

Multiparty/proportional systems: more differentiated party offers and generally greater opportunity for ideological congruence, but post-election coalition bargaining, thresholds and uncertainty can reduce the direct connection between a preferred party and the eventual governing program.

The comparative literature therefore supports the term choice compression, while providing little basis for the stronger term choice elimination.

Assessment of anti-system and revolutionary pathways

The central causal ladder can now be evaluated directly.

“I dislike these candidates.”
Very common in contemporary politics but analytically weak. Candidate dissatisfaction may result from personalities, incumbency, campaign conditions or polarization. It supplies almost no evidence by itself for the institutional hypothesis.

“Neither major party represents me.”
Substantially supported. Gallup's persistent majority saying a third party is needed, together with the 2025 finding that only 30% regarded the two parties as adequately representative, demonstrates a large constituency dissatisfied with the existing party offer. ^{source ref}

“The rules prevent my preferred alternative from becoming viable.”
The institutional proposition is strongly supported by comparative electoral-system research and by U.S. wasted-vote behavior. The subjective attribution is less directly measured: Gallup shows that voters respond to viability and spoiler concerns, not that all of them consciously blame single-member plurality rules. ^{source ref}

“Therefore government is unresponsive to people like me.”
Plausible and moderately supported. Representational inclusion is related to external efficacy in other U.S. contexts, while comparative party-system studies link congruent viable representation to democratic satisfaction. ^{source ref}

“Therefore the political system needs major reform.”
Plausible for some citizens and consistent with very high U.S. reform demand, but the causal fraction attributable specifically to electoral choice compression is unknown. Evaluations of officials, incumbent performance and numerous other grievances also predict reform demand. ^{source ref}

“Therefore the political system is illegitimate.”
Not established. Satisfaction-with-democracy measures and demands for reform are not measures of regime legitimacy. Many democratically committed citizens criticize institutions because they want democratic representation improved.

“Therefore the political system should be replaced.”
Not established as a consequence of party-choice compression. Existing broad questions about “complete reform” are too ambiguous to demonstrate regime replacement preferences. ^{source ref}

“Therefore revolutionary or violent action is warranted.”
No adequate direct support found. The strongest U.S. literature on political violence emphasizes other predictors, including partisan extremity, identity threat, racism/xenophobia, resentment and distrust. ^{source ref}

That pattern matters for the original phrase “a major source.” Demonstrating that constrained choice contributes to dissatisfaction is not enough. To call it a major source of revolutionary sentiment, research would need to show both a substantial causal effect and a magnitude comparable to competing explanations. I found no study that does so.

The hypothesis would be much better supported if framed more narrowly:

U.S. winner-take-all electoral institutions compress diverse political preferences into a small viable choice set, and the resulting representational mismatch and strategic-voting pressures contribute to political alienation and demand for electoral or political reform.

That proposition has moderate-to-strong empirical support.

The stronger proposition—

This compression is a major cause of fundamental rejection of U.S. democratic institutions or revolutionary sentiment

—currently has insufficient empirical support.

Confidence assessment

The most important asymmetry in the evidence is therefore clear: confidence is high at the beginning of the causal chain and falls sharply toward the end. Political science can say with considerable confidence that U.S. institutions compress electoral competition and that voters strategically respond to viability. It can say with moderate confidence that representational mismatch harms democratic satisfaction. It cannot currently say with comparable confidence that this mechanism is a major generator of revolutionary sentiment.

Strongest sources

1. Matthew M. Singer, “Was Duverger Correct? Single-Member District Election Outcomes in Fifty-three Countries,” British Journal of Political Science. Large comparative test using 6,745 district contests; probably the strongest single empirical source on the basic institutional mechanism. Cambridge Core. ^{source ref}

2. William Roberts Clark & Matt Golder, “Rehabilitating Duverger's Theory: Testing the Mechanical and Strategic Modifying Effects of Electoral Laws,” Comparative Political Studies, 2006. Reassesses cross-national evidence and finds properly specified tests largely consistent with Duvergerian expectations. DOI. ^{source ref}

3. Barry C. Burden, “Minor Parties and Strategic Voting in Recent U.S. Presidential Elections,” Electoral Studies, 2005. Direct U.S. evidence from 1992, 1996 and 2000; shows strategic effects vary with competitiveness and finds particularly strong instrumental strategic voting against Nader in competitive states in 2000. ScienceDirect. ^{source ref}

4. Barry C. Burden, “Ballot Regulations and Multiparty Politics in the States,” PS: Political Science & Politics, 2007. Concise treatment of single-member districts, strategic voting and additional legal barriers facing minor parties. Cambridge Core. ^{source ref}

5. Mark Fey, “Duverger's Law Without Strategic Voting,” 2007. Important theoretical counterargument: strategic candidate behavior can produce two-candidate competition even when voters themselves are sincere. Author publication page. ^{source ref}

6. David C. Herron & Jeffrey B. Lewis, “Did Ralph Nader Spoil a Gore Presidency? A Ballot-Level Study of Green and Reform Party Voters in the 2000 Presidential Election,” Quarterly Journal of Political Science, 2007. Essential treatment of the spoiler counterfactual and why minor-party votes cannot simply be reassigned one-for-one to a major candidate. DOI.

7. Jeffrey M. Jones/Gallup, “Americans See Need for Third Party, but Offer Soft Support,” 2025. The strongest recent direct evidence on the exact proposed psychological mechanism: third-party demand, perceived nonviability, wasted-vote fear, spoiler fear and stated strategic switching. Gallup. ^{source ref}

8. Kathleen Bawn et al., “A Theory of Political Parties: Groups, Policy Demands and Nominations in American Politics,” Perspectives on Politics, 2012. Core counterargument to a simplistic “two choices only” model: parties function as coalitions of organized groups and activists, with significant political competition occurring inside them. Cambridge Core. ^{source ref}

9. Alan I. Abramowitz & Steven Webster, “The Rise of Negative Partisanship and the Nationalization of U.S. Elections in the 21st Century,” Electoral Studies, 2016. Crucial for separating lesser-of-two-evils/negative voting from the claim that the two alternatives are substantively identical. ScienceDirect. ^{source ref}

10. Sara B. Hobolt, Julian Hoerner & Toni Rodon, “Having a Say or Getting Your Way? Political Choice and Satisfaction with Democracy,” European Journal of Political Research, 2021. Particularly important because it distinguishes nominal ideological congruence from viable/instrumental representation; the latter is what predicts greater democratic satisfaction. Wiley. ^{source ref}

11. Lawrence Ezrow & Georgios Xezonakis, “Citizen Satisfaction With Democracy and Parties' Policy Offerings,” Comparative Political Studies, 2011. Cross-national evidence that the ideological quality of the party offer predicts democratic satisfaction. SAGE. ^{source ref}

12. Christopher J. Anderson & Christine A. Guillory, “Political Institutions and Satisfaction with Democracy: A Cross-National Analysis of Consensus and Majoritarian Systems,” American Political Science Review, 1997. Foundational evidence that consensus institutions reduce the satisfaction penalty experienced by electoral losers, while majoritarian institutions benefit winners. Cambridge Core. ^{source ref}

13. Pew Research Center, “Attitudes toward Reforming the Political System in 25 Countries,” 2025. Useful for distinguishing broad American demand for major/complete political reform from specific rejection of democracy or revolutionary sentiment. Pew Research Center. ^{source ref}

14. Katelyn E. Stauffer, “Public Perceptions of Women's Inclusion and Feelings of Political Efficacy,” American Political Science Review, 2021. U.S. evidence connecting perceived representation/inclusion to external political efficacy; useful as supporting evidence for the psychological mechanism, though it does not test two-party compression specifically. Cambridge Core. ^{source ref}

15. James A. Piazza, study of political violence, Trump approval, racism and xenophobia. Important principally as counterevidence to mono-causal explanations of anti-system violence: U.S. support for political violence has identifiable pathways through partisan/identity grievances that are not reducible to lack of electoral alternatives. PubMed Central. ^{source ref}

The evidence across these sources supports a relatively precise final judgment: the American electoral system does compress political choice in a meaningful, measurable and partly self-reinforcing way; voters notice that constraint and sometimes change their votes because of it. That mechanism plausibly contributes to alienation and reform demand. What has not been demonstrated is the final leap from constrained electoral choice to fundamental illegitimacy, regime replacement, or revolutionary sentiment. Those outcomes require separate measurement and appear to have important alternative causes.