The DOI matches its Crossref record; 74 of the 76 references it cites were found in a registry or an index.
Fear and Loathing across Party Lines: New Evidence on Group Polarization
Abstract
When defined in terms of social identity and affect toward copartisans and opposing partisans, the polarization of the American electorate has dramatically increased. We document the scope and consequences of affective polarization of partisans using implicit, explicit, and behavioral indicators. Our evidence demonstrates that hostile feelings for the opposing party are ingrained or automatic in voters' minds, and that affective polarization based on party is just as strong as polarization based on race. We further show that party cues exert powerful effects on nonpolitical judgments and behaviors. Partisans discriminate against opposing partisans, doing so to a degree that exceeds discrimination based on race. We note that the willingness of partisans to display open animus for opposing partisans can be attributed to the absence of norms governing the expression of negative sentiment and that increased partisan affect provides an incentive for elites to engage in confrontation rather than cooperation.
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In the citing paper
“In the political domain, there is ample evidence that affective polarization is on the rise (Finkel et al. 2020, Iyengar & Westwood 2015), leading to concerns about reduced support for democratic norms (Broockman et al. 2022, Kingzette et al. 2021).”
From Social Media and Morality. (2024) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“Some studies have found that polarization includes affective aspects related to ideology that foster the difference between groups, favoring severe divisions between us and them.”
From La ideología política, las creencias sociales y la polarización como obstáculos psicosociales para la democracia y la paz en Colombia, 2016-2020 (2024) · cites this paper as Iyengar & Westwood, 2015
In the citing paper
“For various authors, it is an affective polarization associated with social beliefs and the configuration of the other as an enemy or adversary.”
From La ideología política, las creencias sociales y la polarización como obstáculos psicosociales para la democracia y la paz en Colombia, 2016-2020 (2024) · cites this paper as Iyengar & Westwood, 2015
In the citing paper
“This is because personalistic links are established with electoral candidates that lead to a consideration of the other as an enemy.”
From La ideología política, las creencias sociales y la polarización como obstáculos psicosociales para la democracia y la paz en Colombia, 2016-2020 (2024) · cites this paper as Iyengar & Westwood, 2015
In the citing paper
“Hence, polarization has an emotional and affective dimension that unfolds in social life and everyday relationships and goes beyond ideological opposition.”
From La ideología política, las creencias sociales y la polarización como obstáculos psicosociales para la democracia y la paz en Colombia, 2016-2020 (2024) · cites this paper as Iyengar & Westwood, 2015
In the citing paper
“This results in moral disqualification of the opponent, oversimplification of their position, exacerbation of disputes in everyday interactions, and personalization of political events.”
From La ideología política, las creencias sociales y la polarización como obstáculos psicosociales para la democracia y la paz en Colombia, 2016-2020 (2024) · cites this paper as Iyengar & Westwood, 2015
In the citing paper
“Many scholars link these negative feelings to shifts in identity, with partisanship emerging as an important social identity under which many societal divisions and conflicts are coming to align (15–18).”
From How digital media drive affective polarization through partisan sorting (2022) · cites this paper as [16]
In the citing paper
“Iyengar and Westwood (2015) use trust and dictator games to show people discriminate against those from other parties more than they do toward people of different races (also see Carlin & Love, 2013, 2018;Whitt et al., 2024).”
From Measuring affective polarization: Matching concepts to measures (2026) · cites this paper as Iyengar and Westwood (2015)
In the citing paper
“From a social identity perspective, affective polarization is a natural offshoot of this sense of partisan group identity”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“The results indicated little racial bias; whites, in fact, preferred the African American applicant (55.8%).”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“The difference in the D-score-the operational indicator of implicit bias-across the party divide was 0.50, while the corresponding difference in implicit racial bias across the racial divide was only 0.18 (see also Theodoridis 2017 for an application of implicit measures to the study of partisanship).”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“Relative to implicit racial bias, implicit partisan bias is more widespread.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“Results show that copartisans consistently receive a bonus while opposing partisans are subject to a financial penalty.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“Interestingly, implicit bias is less pronounced than explicit bias as measured through survey questions; 91% of Republicans and 75% of Democrats in the same study explicitly evaluated their party more favorably.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“But 79.2% of Democrats picked the Democratic applicant and 80% of Republicans picked the Republican applicant.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“Their results showed that implicit bias is ingrained; approximately 70% of Democrats and Republicans show a bias in favor of their party.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“These results held even when the out-party candidate had a significantly higher grade point average (4.0 versus 3.5); the probability of a partisan selecting the more qualified out-party candidate was never above 30%.”
From The Origins and Consequences of Affective Polarization in the United States (2019) · cites this paper as Iyengar & Westwood 2015
In the citing paper
“The body of literature on mass political polarization in the USA has yielded mixed findings: ordinary citizens are deeply divided9,31,35,41–49 or they are not10,29,36,50–54; polarization poses a huge threat to democratic functioning3,11,55, is not a problem at all13,56–58 or the nature of the threat is ambiguous7,59,60.”
From Cognitive–motivational mechanisms of political polarization in social-communicative contexts (2022) · cites this paper as [44]
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“Previous research suggests stronger bias against the outgroup among Republicans and conservatives (Jost et al. 2003; Jost, Hennes, and Lavine 2013; Stern et al. 2012), but our evidence indicates that the polarization scores (both explicit and implicit) for partisans on the left and right were generally indistinguishab…”
ResultWhat Americans Know about Politics and Why It Matters
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Flagged first, then by citations
2 of the 76 references couldn’t be matched to a known paper.
Research works printed but not linked: 3
- Campbell Angus, 1960, The American Voter
- Korte Gregory, 2012, Obama Has Edge in Political Merchandise, USA Today
- Rosenfeld Michael J., 2011, How Couples Meet and Stay Together, Waves 1, 2, and 3: Public Version 3.04
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The Disinfectant Diversion: The Use of Narratives in Partisan News Media
Trifiro, B. M., Wells, C., & Rochefort, A. (2022) · Mass Communication & Society · doi:10.1080/15205436.2022.2116719 · Cited by 6
Popular… to a Point: The Enduring Political Challenges of the Public Option
McIntyre, A. L., Blendon, R. J., Benson, J. M., Findling, M. G., & Schneider, E. C. (2023) · Milbank Quarterly · doi:10.1111/1468-0009.12599 · Cited by 5
Wagner, J. K. (2023) · Frontiers in Political Science · doi:10.3389/fpos.2022.1022782 · Cited by 5
Perceiver and target partisanship shift facial trustworthiness effects on likability
Malloy, C. S., Hughes, C. S., & Cassidy, B. S. (2023) · Scientific Reports · doi:10.1038/s41598-023-33307-8 · Cited by 7
Nabity-Grover, T., Matthews, K. D., Roth, P. L., Kwon, Y., & Thatcher, J. B. (2025) · Information Systems Research · doi:10.1287/isre.2020.0497 · Cited by 3
Villa-Gómez, J. D., Díaz-Pérez, I. L., Saavedra-Florez, T., Sanchez-Jaramillo, C. A., & Insuasty Rodríguez, A. (2024) · Ratio Juris · doi:10.24142/raju.v19n38a7 · Cited by 3
Cuéllar Rivero, R. (2024) · Revista Española de Ciencia Política · doi:10.21308/recp.64.07 · Cited by 3
Thornton, J. R. (2025) · American Politics Research · doi:10.1177/1532673x251347623 · Cited by 2
Measuring affective polarization: Matching concepts to measures
Druckman, J. N., Klar, S., Krupnikov, Y., Levendusky, M., & Ryan, J. B. (2026) · Political Psychology · doi:10.1111/pops.70152 · Cited by 1
Cuéllar Rivero, R. (2026) · Revista Española de Investigaciones Sociológicas · doi:10.5477/cis/reis.194.25-44
“…la diferencia entre la adhesión o favorabili-dad hacia determinados grupos sociales o actores políticos percibidos como propios o cercanos ( in-group) y el rechazo u hos-tilidad hacia los percibidos como opues-tos o adversarios ( out-group ) (Druckman y Levendusky, 2019; Iyengar y Westwood, 2015).”
Metadata
- Authors
- Iyengar, S., & Westwood, S. J.
- Affiliations
- Stanford University (US)
- Princeton University (US)
- Venue
- American Journal of Political Science
- Publisher
- Wiley
- Published
- 2014-12-16
- Volume
- 59
- Issue
- 3
- Pages
- 690-707
- ISSN
- 0092-5853 (ISSN-L)
- 1540-5907
- OpenAlex
- W2137998590
- Cited by
- 2,452
- References
- 76
- Citations by year
- 2026: 241 · 2025: 226 · 2024: 249 · 2023: 313 · 2022: 248 · 2021: 273 · 2020: 330 · 2019: 232 · 2018: 165 · 2017: 96 · 2016: 55 · 2015: 20 · 2014: 2
- FWCI
- 374.27
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Political Science (publishedVersion)
- Topics
- Social Sciences › Political Science and International Relations › Electoral Systems and Political Participation
- Social Sciences › Sociology and Political Science › Social and Intergroup Psychology
- Social Sciences › Sociology and Political Science › Names, Identity, and Discrimination Research
- Keywords
- affective polarization, party identification, partisan hostility, social identity, racial discrimination, implicit attitudes, American voters
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