Previous empirical research has found evidence suggesting that the character-based valence attributes of parties, such as competence and integrity, can have notable effects of levels of electoral support (Clark, 2009; Mondak, 1995). A related strand of literature analyzes the importance of parties' policy positions. In this study, we bring together research on valence and party dispersion to examine whether the ideological dispersion of parties in a party system mediates the electoral impact of valence. We perform empirical analyses covering nine Western European countries over the period 1976 to 2003, and test the hypothesis that when parties are more ideologically proximate to the mean voter position, character-based valence attributes will be of greater significance in determining parties' electoral fortunes. Surprisingly, we find no support for this hypothesis. Instead, our analyses suggest that the more ideologically dispersed parties are, the more likely it is that character-based valence attributes will affect parties' vote shares.
