"This research makes two types of contributions to existing political science literature. On a theoretical level, it argues for a reconceptualization of the motives of candidates and parties in rational choice analysis. On a practical level, it seeks to enrich our understanding of the role that challengers play in American elections and of the reason why different types of challengers emerge in different types of elections. Boatright argues that the role of challengers in the American electoral process can be understood only if we broaden our theories about rational candidate behavior."--BOOK JACKET.