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*The World Public Opinion provides in-depth information and analysis on public opinion from around the world on international issues.
 
*The World Public Opinion provides in-depth information and analysis on public opinion from around the world on international issues.
 
*Nielsen Ratings, virtually always for television.
 
*Nielsen Ratings, virtually always for television.
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*Rasmussen Reports (Republican)
 
*Garin Hart Yang (Democratic)
 
*Garin Hart Yang (Democratic)
 
*Ayres, McHenry & Associates (Republican)
 
*Ayres, McHenry & Associates (Republican)
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Several organizations monitor the behaviour of pollsters and the use of polling data, including PEW and, in Canada, the Laurier Institute for the Study of Public Opinion and Policy.[http://www.wlu.ca/lispop/lispop]
 
Several organizations monitor the behaviour of pollsters and the use of polling data, including PEW and, in Canada, the Laurier Institute for the Study of Public Opinion and Policy.[http://www.wlu.ca/lispop/lispop]
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==Famous Failures==
 
==Famous Failures==
 
The best-known failure of opinion polling to date in the U.S. was the prediction in 1948 that Thomas Dewey would defeat Harry S. Truman.  Major polling organizations, including Gallup and Roper, indicated a landslide victory for Dewey.
 
The best-known failure of opinion polling to date in the U.S. was the prediction in 1948 that Thomas Dewey would defeat Harry S. Truman.  Major polling organizations, including Gallup and Roper, indicated a landslide victory for Dewey.

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