It is commonly believed that majority voting enhances parties to cluster around the centre of the political space, whereas proportional systems (PR) foster great ideological divergence. The theoretical arguments for these expectations go back to the work of Downs (1957) and Duverger (1954). More recent studies, however, produced quite contradictory empirical findings. In this paper I will test whether similar arguments hold true for the positioning of candidates campaigning in different electoral systems. The elections for the two chambers of the Swiss Parliament and the data from the Swiss Electoral Studies (SELECTS) and the Swiss Voting Advice Application (VAA) smartvote offer an excellent -almost laboratory like -opportunity to do so empirically. The analyses show clearly, the theoretical claims that majority voting necessarily fosters more moderate positions find no support. The candidates for the Council of States, elected in a majority system, are not more moderate than their fellow party candidates for the National Council which are elected in a PR system.
KEYWORDS: Electoral systems, PR voting, Polarization, Campaigning, VAAsThe impact of the electoral system on the positioning of the parties and candidates in the course of campaigns (and afterwards) is an intensely debated question in electoral research and parliamentary studies. It is commonly believed that majority systems enhance parties to cluster around the centre of the political space, whereas proportional systems (PR) foster greater ideological divergence. Similar expectations can also be formulated for candidates provided that they have the possibility to position themselves strategically. The theoretical arguments for these expectations are grounded in Downs' (1957) theory of the median voter and Duverger's (1954) law which claims that majority voting promotes two party systems. More recent studies, however, brought forward quite contradictory empirical findings (Dow 2001, 2010, Ezrow 2008, Curini/Hino 2012.The Swiss political system and the data from the Swiss Electoral Studies (SELECTS) together with data from the Swiss Voting Advice Application (VAA) smartvote 2 offer an excellent opportunity to address this question empirically.