Ticket Splitting in a Nationalized Era
Many believe that party loyalty in U.S. elections has reached heights unprecedented in the post-war era, although this finding relies on evidence from presidential, congressional, and gubernatorial elections. If party labels are a heuristic, we would expect party-line voting to be even more dominant in lower-information elections. Yet, here I show that the prevalence of ticket splitting in state and local offices is often similar to or higher than in national offices because of larger incumbency advantages and starker candidate valence differentials. Because neither surveys nor election returns have been able to reliably measure individual vote choice in downballot races, I introduce an underused source of voter data: cast vote records. I create a database from voting machines that reveals the vote choices of 6.6 million voters for all offices on the long ballot, and I design a clustering algorithm tailored to such ballot data. In contrast to ticket splitting rates of 5 to 7 percent in US House races, about 15 to 20 percent of voters split their ticket in a modal Sheriff race. Even in a nationalized politics, a fraction of voters still cross party lines to vote for the more experienced candidate in state and local elections.