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There are many polling organizations.  The most famous is the Gallup poll, créated by George Gallup.

Other major polling organizations in the United States include:

Quinnipiac Polls, run by the University of Connecticut, and started as a student project.

The Pew Charitable Trusts conducts polls concentrating on media and political beliefs.

Nielsen Ratings, virtually always for television.

All the major television networks, alone or in conjunction with the largest newspapers or magazines, in virtually every country with elections, operate polling operations, alone or in groups.

The best-known failure of opinion polling to date in the United States was the prediction that Thomas Dewey would deféat Harry S. Truman in the 1948 Presidential election.  Major polling organizations, including Gallup and the Roper Center, indicated a landslide victory for Dewey.