Roper Center for Public Opinion Research
http://www.ropercenter.uconn.edu/
This site features over a quarter-million questions from 1935 to the present.
Search by keyword, subject, date and survey firm to find what poll data. Subscription
Required. American Association for Public Opinion Research
http://www.aapor.org/
An association of people interested in the methods, applications and analysis
of public opinion and survey research. They publish the Public Opinion Quarterly
Online Survey Research/Public Opinion Centers
http://www.ukans.edu/cwis/units/coms2/po/index.html
Related Internet resources organized by University of Kansas
Suggested Library of Congress Headings Public
Opinion--United States Other
LC Subject Headings Related to Public Opinion | 
2002 McGraw-Hill Higher Education