(ProQuest) - Provides government statistics, business, trade, and research information, and private and international statistical information. U.S. government statistics go back to 1973 and private and state sources go back to 1980.
The Gallup Organization has been collecting public opinion data extensively since 1935. Their free website provides some of this information to the public. The site allows for topic keyword searches and also has a topic index.
(Cornell University) - A search interface to the Roper Center for Public Opinion Research, a non-profit education and research organization that studies politics, government, public institutions, international relations, business, social affairs, and consumer behavior. Includes sources from major broadcasting and news organizations.