Explaining Uncontested Seats in Congress and State Legislatures

A fundamental requirement of democracy is the existence of contested elections. Our study documents and explains trends in uncontested seats in the U.S. Congress and state legislatures over time. We uncover a striking inconsistency in the health of elections: the frequency of uncontested seats in Congress has declined while the frequency of uncontested seats in state legislatures has actually increased. To explore these divergent trends, we consider factors that are common to both Congress and state legislatures such as the redistricting cycle but also variables that are unique to the state level. Our analysis points to the relative "flippability" of Congress compared to many state legislatures as a factor behind diverging levels of contestation. While many state legislatures have become bastions for dominant parties, congressional districts in those same states are often nonetheless viewed as enticing targets because they contribute to control of the federal government.