The Moral Roots of Partisan Division: How Moral Conviction Heightens Affective Polarization

Kristin N. Garrett and Alexa Bankert

British Journal of Political Science, 2020, vol. 50, issue 2, 621-640

Abstract: Partisan bias and hostility have increased substantially over the last few decades in the American electorate, and previous work shows that partisan strength and sorting help drive this trend. Drawing on insights from moral psychology, however, we posit that partisan moral convictions heighten affective polarization beyond the effects of partisanship, increasing partisan animosity and copartisan favoritism. Testing this theory using data from two national samples and novel measures of affective polarization in everyday life, we find that people who tend to moralize politics display more partisan bias, distance and hostility, irrespective of partisan strength. These results shed light on a different moral divide that separates the American public and raise key normative questions about moral conviction and electoral politics.

Date: 2020
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