The Multiple Roots of Party Loyalty: Explaining Republican Dissent in the U.S. House of Representatives

Why does any member of Congress choose to be loyal to one's party? The conventional wisdom is that party loyalty stems from constituent expectations, electoral concerns, or a lawmaker's ideological beliefs. However, this neglects two other, less-instrumental reasons for sticking with a political party: partisan identity and personal connections with party leaders. I test these alternative theories as well as conventional ones on a set of key moments in the 113th Congress (2013-2014) when rebellion against House Republican leadership by the rank-and-file was especially noteworthy. The results provide some support for both the party identity and personal connection hypotheses. They also indicate that although constituency characteristics help predict the likelihood of dissent from GOP leaders, there is little evidence for the electoral hypothesis, while cross-cutting ideological preferences as well as preferences along the traditional left-right spectrum prove statistically significant. In short, evidence reveals both personal and instrumental roots of party loyalty in Congress.