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United States presidential approval rating — In the United States, presidential job approval ratings were introduced by George Gallup in the late 1930s (probably 1937) to gauge public support for the President of the United States during his term. An approval rating is a percentage… … Wikipedia
Bradley effect — Tom Bradley speaking at AIDS Walk LA at the Paramount Studios lot in 1988 The Bradley effect, less commonly called the Wilder effect,[1][2] is a theory proposed to explain observed discrepancies between voter opinion polls and el … Wikipedia
