What explains elite affective polarization? Evidence from Canadian politicians

Concerns about affective polarization are on the rise globally, and it has been associated with negative outcomes such as diminished trust in government and discrimination against out-partisans. While elected politicians are typically thought to be a major source of mass-level affective polarization, and despite the policy and representation consequences of heightened partisan hostility in legislatures, existing research has focused almost exclusively on the measurement and explanation of affective polarization among citizens. As a result, we know far less about the magnitude and sources of elite affective polarization. Here, we take a step towards addressing this gap using an original survey of hundreds of Canadian local politicians, a setting uniquely situated for addressing the role of a host of individual-level and institutional-level predictors of affective polarization. We find that Canadian local politicians are, on average, less affectively polarized than the citizens they represent. However, levels of affective polarization among these politicians vary considerably, with higher levels of affective polarization among politicians who are ideologues, partisans, and who harbor strong progressive ambition. We conclude by discussing the implications of our findings for research on affective polarization and describe the need for comparative studies of affective polarization among political elites.