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The Roper Center for Public Opinion Research maintains one of the most complete collections of public opinion data. Data contributors include many major commercial polling firms and media survey organizations, such as ABC News, CBS News, Fox News, the Gallup Organization, Los Angeles Times, National Opinion Research Center, NBC News, New York Times, Princeton Survey Research Associates, USA Today, the Washington Post, and many others. RoperExpress, a data access tool for on-demand downloading of data in the Roper Center collection that are in ASCII or SPSS portable formats, is also available. This databank is a comprehensive, up-to-date source for questions asked on U.S. nationwide public opinion surveys since 1935. It provides question wordings, response percentages, and full survey-level citations. 1935 to the present. In order to start using iPOLL, click "iPOLL Login" and complete the "iPOLL New User Registration" page on the website. 1935 - present.