Across Western democracies, individuals frequently vote for different parties in different elections. A variety of explanations have been proposed for this behavior. In the European context, scholars have focused on the idea that individuals may vote for different parties because some elections are less important than others (i.e., are “second-order” elections). In the U.S. context, scholars have focused on the possibility that individuals might vote for different parties because they care about how the two chambers will affect policy outcomes. In this article, the authors test among four alternative motivations for vote switching, two predicated on the notion that individuals treat one of the elections as second-order and two predicated on the notion that individuals care about policy outcomes from both chambers. The tests are performed by analyzing Euro-barometer survey data on individual voting behavior in European national and European Parliament elections. The authors find support for all four motivations.