Polarization,Ideology, and Vote Choice in U.S. Congressional Elections

Despite the debate about mass polarization, most scholars agree that parties in Congress have become increasingly polarized over time. Scholars have sought to connect party polarization to the beliefs and perceptions of individual citizens, but little work exists on the relationship between polarization and the vote choices made by ordinary citizens. In this article, I examine the link between party polarization at the elite level, the use of ideology by citizens, and their vote choices in Congressional elections. I argue that the increased polarization that has occurred over time has led people to place more weight on ideology when casting their votes in U.S. House elections. My hypothesis stems from work on group conflict theory, which suggests that when people sense a high degree of conflict between two groups, a cue from elites, they will be more likely to rely on their own relevant characteristics or attitudes when making choices. This study differs from previous work on Congressional elections in that I examine variation in the effect of ideology on vote choice over multiple elections rather than just in one or two elections. I argue that an exploration of the political context (or the political context perceived by voters) is necessary in order to more fully understand the use of ideology in U.S. elections. To the extent that polarization facilitates the use of information shortcuts among voters, it might be viewed as a positive development within the context of electoral politics.