Example image of eyePlorer eyePlorer map for 'Opinion poll': Public opinion Sampling (statistics) Statistical survey Confidence interval Andrew Jackson John Quincy Adams President of the United States Straw poll United States presidential election, 1824 The Literary Digest Woodrow Wilson Postcard United States presidential election, 1936 Republican Party (United States) Alf Landon Franklin D. Roosevelt George Gallup Louis Harris Conservative Party (UK) Labour Party (UK) The Gallup Organization United Kingdom Winston Churchill Iraq Saddam Hussein Angus Reid Strategies Internet YouGov Zogby International Sampling error Margin of error Poll average Bradley effect Shy Tory Factor Selection bias Response bias Racism Sexism Spiral of silence Attitude (psychology) Psychometrics Mobile phone United States presidential election, 2008 Barack Obama Telephone Consumer Protection Act of 1991 Exit poll Swing (politics) Abbas Abdi ACNielsen Australia