Explaining State Variation in Interparty Ideological Differences

Abstract

This article uses two measures of state party ideology—a 1994 survey of state party committee members and a content analysis of state party platforms between 1990 and 1996—to determine variation between states in interparty ideological differences. These interparty ideological differ ences are compared to David Mayhew's scale measuring the historical presence of traditional party organizations in the American states. As hy pothesized, there is a strong tendency for states with histories of tradi tional party organization to have less ideologically polarized parties than those states without such traditions. This association holds up when we control for state-level measures of education, income, mass polarization, electoral competition, and party control. State environments that histori cally encouraged or discouraged the formation of traditional party orga nizations help explain variation in patterns of party activism in the contemporary era.