Party Unity in the Swiss Parliament: The Electoral Connection

This study investigates the connection between legislative and electoral politics in Switzerland. The authors postulate that party unity is higher in an election year, and more specifically in votes on issues that are important for the party platform and that are of greater visibility to voters. The authors analyse the entire voting record of the Swiss parliament (lower house) on legislative acts between 1996 and 2007, which consists of roll call votes as well as unpublished votes. The authors find a strong effect of elections on voting unity among certain parties, and also find encouraging support for the hypotheses that this effect is mediated by the visibility of the vote and related issue salience.