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We trace the rise, fall, and resurgence of political ideology as a topic of research in social, personality, and political psychology. For over 200 years, political belief systems have been classified usefully according to a single left—right (or liberal-conservative) dimension that, we believe, possesses two core aspects: (a) advocating versus resisting social change and (b) rejecting versus accepting inequality. There have been many skeptics of the notion that most people are ideologically inclined, but recent psychological evidence suggests that left-right differences are pronounced in many life domains. Implicit as well as explicit preferences for tradition, conformity, order, stability, traditional values, and hierarchy—versus those for progress, rebelliousness, chaos, flexibility, feminism, and equality—are associated with conservatism and liberalism, respectively. Conservatives score consistently higher than liberals on …