Survey Methods
Results are based on telephone interviews conducted as part of Gallup Daily tracking March 21-April 3, 2011, with random samples of Republicans and Republican-leaning independents, aged 18 and older, living in all 50 U.S. states and the District of Columbia, selected using random-digit-dial sampling. Questions asking about the 14 potential candidates measured in this research were rotated among randomly selected samples of Republicans each night; over the 14-day period, each candidate was rated by a minimum of 1,500 Republicans and Republican-leaning independents.
For the overall ratings of each candidate among Republicans and Republican-leaning independents, including recognition scores, one can say with 95% confidence that the maximum margin of sampling error is ±3 percentage points. For the Positive Intensity Score for each candidate, the maximum margin of sampling error varies depending on the size of the group recognizing the candidate.
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