Does Political Participation Contribute to Polarization in the United States?

Polarization and participation are often connected in the political science literature, though sometimes the causality runs participation to polarization and sometimes the causality runs in the reverse direction. In some accounts there is an expectation that increasing participation and increasing polarization generate an ongoing spiral effect. In this paper we evaluate the over-time relationships between polarization and participation by assessing evidence in existing panel and aggregate data. We find that people with more extreme attitudes are more likely to participate in politics. However, only one particular form of participation—persuading others—appears to predict later levels of polarization. Therefore, only persuasion has the necessary correlation and temporal ordering for a feedback loop with more extreme ideology. The implication is that the discipline should pay more attention to interpersonal persuasion as a form of participation in American politics.