Gallup
Provides data-driven news based on U.S. and world polls, daily tracking and public opinion research.
Harris Interactive
Searchable data from Harris opinion polls from 1963-present.
Pew Research Center
Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping America and the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Pew Research Center does not take policy positions. It is a subsidiary of The Pew Charitable Trusts.
Roper Center: Public Opinion Archives
One of the world's leading archives of social science data, specializing in data from surveys of public opinion. The data held by the Roper Center range from the 1930s, when survey research was in its infancy, to the present.