Largest collection of public opinion poll data, 1935-present. Contains more than 825,000 searchable questions and over 25,000 datasets from both U.S. and international polling organizations. Topics include social issues, politics, pop culture, international affairs, science, the environment, and much more. When available, results charts, demographic crosstabs, time-series trends, and full datasets are provided for immediate download. Registration is required but free using your Princeton email. Many of iPoll's international surveys are not searchable at the question level, but downloadable as full datasets. See also Roper's Featured Projects, including their Health Poll Database and Researching Black American opinion.