One of the most famous polls for more than 70 years, Gallup delivers "relevant, timely, and visionary research on what people around the world think and feel."
The Harris Poll is "one of the longest running independent opinion polls in the United States and now is conducted in Western Europe. Policy makers, business leaders and members of the media all rely on the unquestionable integrity of this poll to obtain accurate, reliable information on topics as diverse as our participants."
"The Center is an independent opinion research group that studies attitudes toward the press, politics and public policy issues."
"The Political Forecasting Special Interest Group is a resource for scholars and practitioners interested in forecasting elections and other political events."
"An independent, nonpartisan resource on trends in American public opinion."
A site that computes current polling trends for political races all over the country using regression trend lines rather than averages of of polls.
"For over a quarter of a century, Public Agenda has been providing unbiased and unparalleled research that bridges the gap between American leaders and what the public really thinks about issues ranging from education to foreign policy to immigration to religion and civility in American life. Nonpartisan and nonprofit, Public Agenda was founded by social scientist and author Daniel Yankelovich and former Secretary of State Cyrus Vance in 1975."