Pew Research Center - U.S. Politics & Policy
The Pew Research Center for the People & the Press is an independent, non-partisan public opinion research organization that studies attitudes toward politics, the press and public policy issues.
Polling the Nations
Polling the Nations is an online database of public opinion polls containing the full text of 500,000 questions and responses from 14,000+ surveys conducted from 1986 through the present in the United States and more than 100 other countries around the world.
Gallup - Reports
Browse, search and download reports from Gallup. (Downloading reports requires filling out a form with personal information.)