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The IBD/TIPP Poll was conducted May 31 through June 5, 2016, surveying 908 Americans, giving it an overall margin of error of +/- 3.3 percentage points. The poll was taken by live interviewers using both land and cellphones.
The unweighted sample size for registered Republicans and Republican leaners was 421, with a margin of error +/- 4.9 percentage points. For Democrats and Democratic leaners, the sample size was 351, with a margin of error of +/- 5.3 percentage points.
http://www.investors.com/wp-content/uploads/2016/06/ibdtipp-Tables_June2016_Posting-1.pdf