Objective We extend prototype theory to explain why nonmembers who are socially connected to group members hold political attitudes that differ from nonmembers lacking that connection. We anticipate that the intensity of nonmember attitudes varies by connection to a prototype or periphery group member. Methods Using data from the 2006 Cooperative Congressional Election Study (CCES), we model group‐salient political attitudes for veterans, union members, and their family members. Results We find social distance from group members is theoretically linked to within‐group variation that distinguishes prototype from periphery group members. Conclusion Analysis of political attitudes is enhanced beyond the traditional member/nonmember dichotomy by accounting for nonmembers’ social distance from group members.