Abstract
The midpoint of the left‐right self‐placement item is hiding important political diversity, and may be conflating moderate responders with populists and other political sub‐groups. Survey researchers should consider this problem when examining relationships between political orientation and political attitudes. We suggest testing for non‐linearity in these relationships, and measuring anti‐establishment and populist beliefs separately. Researchers interested in building theories explaining the psychological underpinnings of ideological extremism should also consider the possibility that a qualitatively different type of ideological extremist self‐places on the midpoint.