Partisanship as Cause, Not Consequence, of Participation

In most democracies, citizens who identify with a political party are more likely than non-partisans to turn out to vote. But why is this the case? Does voting foster partisanship, as prominent models of political learning and cognitive dissonance postulate? Or does partisanship encourage voting, as expressive voting models and social identity theory suggest? I introduce the concept of partisan duty to capture the role of partisan social identities in the turnout decision and present new empirical tests of the relationship between partisanship and voting. I leverage a unique institutional arrangement in Chile to establish the direction of causality with a regression discontinuity, and I implement a novel survey design with behavioral outcomes to identify causal mechanisms. Data from the US confirm that the main findings generalize beyond Chile. Electoral participation does not generate partisanship. Instead, partisanship mobilizes voters: it increases the expressive benefits to voting and generates a sense of duty to support one’s partisan group.