Group-Based Affect and the Canadian Party System

In terms of party systems, Canada's system is an outlier. In our present work, we develop Richard Johnston's account of Canada's polarized pluralism in three ways. First, we link the literature on party systems to social identity theory. Second, we make an empirical contribution by directly testing Johnston's claim that intergroup affect plays a central role in shaping the dynamics of the party system. Using Canadian Election Study data from seven elections, we offer strong empirical support for the theory of polarized pluralism. Congruent with existing research, we find that the most important feature summarizing group-based affect in Canadian politics corresponds with the ideological left/right divide, but we also find that feelings toward groups on a second, uncorrelated axis (feelings toward Quebec and minority groups) shape vote choice. Yet our results show that fault lines in the polarized pluralist structure of the Canadian party system are emerging.