Political Self-Confidence and Affective Polarization.

Even among those who share the same partisan commitments, some people say they despise the opposing party while others report far less animosity. Why are some people more likely to express hostility toward the opposing political party? We explore how individual-level differences in feelings of self-confidence fuel out-party animosities. Drawing on responses to a module of the 2020 Cooperative Election Study, we show that higher levels of internal political efficacy are associated with greater affective polarization.