Bradley effect – Wikipedia, the free encyclopedia
Another Day, Another Democrat-Heavy Poll Sample
Poll Farce: Pew Oversamples Democrats to Boost Obama
Tainted Polls? Pew Oversamples Democrats To Boost Obama
Why Charges of Poll ‘Oversampling’ Are Usually Misguided – New York Times
Quinnipiac Polling’s Peter Brown Tries To Defend Oversampling
Tainted Polls? Pew Oversamples Democrats To Boost Obama
Gallup and Rasmussen are the only 2 polls not oversampling
Partisan Trends in Party Affiliation- Rasmussen Reports™