Voter behavior under STV-PR: Solving the puzzle of the Irish party system

This paper examines voter preferences when voters are allowed to rank order large numbers of candidates both within and between different parties (STV-PR). How voters complete such a ballot has consequences both for models of voting behaviour and also for patterns of party competition. More concretely, although such a system should promote a great deal of candidate centered voting behaviour, this does not, in fact, seem to occur for the case we examine. While Irish voters do seem to exhibit multiple party loyalties they are, nevertheless, party and not candidate specific loyalties. The consequences of this for both a Michigan account of party loyalty and also standard interpretations of Irish party competition are discussed.