Samuel L. Popkin is Research Professor of Political Science at the University of California San Diego and has been a consulting analyst in five Democratic presidential campaigns, in addition to consulting for polling with CBS News and YouGov. He is the author of The Reasoning Voter and The Candidate.
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In Crackup, Samuel L. Popkin tells the story of how the Republican Party fractured into uncompromising groups with irreconcilable demands. Changes in campaign finance laws and the proliferation of mass media opened the way for newly energized groups to sp... SEE MORE