Published online by Cambridge University Press: 28 May 2018
Ideologically impure candidates—RINOs and DINOs—risk losing the endorsement of their fellow copartisans. However, which copartisans? In this article, I assess how party affiliation and the strength of partisan affiliation condition the evaluation of ideologically impure, non-prototypical candidates. Using a nationally representative survey experiment, I present evidence that while partisans negatively evaluate non-prototypical copartisans, there is not a consistent relationship between strength of identification and the degree of punitiveness. Moreover, candidate non-prototypicality causes convergence in candidate support between Republicans and Democrats. My results provide evidence that nominal partisan affiliation is by itself insufficient to save an ideologically non-prototypical candidate from the rebuke of fellow copartisans and thus that the “in-name-only” charge holds some weight.