Institutional and District‐Level Sources of Competition in State Legislative Elections

Objectives. What are the sources of partisan competition in state legislative elections? Specifically, what impact do institutional features have relative to district‐level conditions on competition between party nominees? Methods. Using data from 30 states in 1994 and 1996, a range of factors are examined to determine their influence on both the likelihood that a race is contested and the degree of competition that results. Results. Multiple regression analyses indicate that a district's characteristics, measured as social and partisan diversity, have a strong and durable influence on elections. Contested elections are more likely and competition levels are higher in districts with heterogeneous populations. Institutional characteristics such as legislative professionalism also have a large influence, although the direction of their impact varies by stage of the electoral process examined. For example, professionalism increases the likelihood that an election is contested, but leads to a lower level of competition between opposing candidates. Conclusions. District‐level conditions have a large influence on competition; however, incentives created by institutional features are also critical for understanding the competitiveness of state legislative elections.