Their leads, however, are all within the margin of error, indicating a tight race in the three key early nominating states.
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The New Hampshire survey was conducted from Feb. 3-10 among 381 potential GOP primary voters and has a margin of error of 5%; the Iowa survey was conducted over the same period, among 320 potential GOP caucus-goers, and has a margin of error of 5.5%; and the South Carolina poll was conducted over the same period among 450 potential GOP primary voters and has a margin of error of 4.6%.
