One of the most common critiques of political parties is that they no longer represent the interests of their voters. On one hand, representation literature tasks all parties equally to ensure high ideological congruence with their voters. On the other hand, party behaviour literature acknowledges that parties have legitimately different primary goals, in particular vote-maximisation or policy-seeking. Thus, this article analyses whether ideological congruence depends on the general goals that parties pursue. Furthermore, this article proposes a novel, distribution-based measure of party-voter ideological congruence that reduces the loss of voter information stemming from the many-to-one data relationship. This measure is applied to 470 data points from parties in 10 Western European countries from 1970 to 2009. The article finds that vote-maximising parties create higher levels of congruence than policy-seeking parties. On this basis, the article calls for evaluations of party behaviour considering party-type specificity.
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