Gallup Analytics (1935- )
Gallup polling results plus in-depth survey analyses.
Largest digital social science data archive in the world. Contains public opinion data including US election exit polls. Data files are raw data and not in report format, and are used with software such as SAS, SPSS and Stata.
Public Opinion Research Archive
Congressional Quarterly. Downloadable decades of data on policy issues.
American public opinion index (1981-2000)
Contains public opinion surveys and polls at local, state and national levels. Includes polls by ABC, NBC, CBS, Roper, Gallup and Harris. Published annually.
Gallup Poll (1978-2007)
Measures public response to major historical news events.