Abstract
This tracing of the evolution of the ideologies of congressional parties and presidents between 1947 and 1994 confirms the widespread belief that there is increasing ideological polarization in Washington and shows that the congressional Democratic Party and Republican presidents have undergone particularly dramatic ideological metamorphoses. Analysis shows that alterations in public ideology, institutional reform in Washington, and the altering role of the South in national politics provide the best explanations of this ideological change.

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