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NOTE: Results are from the general-election presidential exit polls conducted across the country by a consortium of news organizations from 1980 through 2008. (The organizations performing the exit polls have changed over the years; the 2008 survey was conducted by the Edison Media Research/Mitofsky International National Election Pool.)

The calculations were performed on exit-poll data files by Emory University political scientist Alan Abramowitz for 1980 and 1984; Ruy Teixeira, a public-opinion analyst and author at the Brookings Institution and the Center for American Progress, for 1988 to 2004; and Joe Lenski, executive vice president of Edison Media Research, for 2008.