A Shifting Electorate
Use the time slider to see how Democratic and Republican candidates have fared in presidential and congressional elections over the past 50 years.
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SOURCE: Atlas of U.S. Presidential Elections, House of Representatives. Exit polls from 1976 to 1988 conducted by CBS News and the New York Times, from 1990 to 2002 by Voter News Service (VNS) and its predecessor, Voter Research and Surveys (VRS), and from 2004 to the present by Edison Media Research (EMR) and Mitofsky International.
GRAPHIC: Wilson Andrews, Karen Yourish, Dan Keating