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About this Poll
Gravis Marketing, a nonpartisan research firm, conducted a random survey of 1,259 registered voters in Iowa regarding potential matchups [388 Republicans]. The poll has a margin of error of ± 3% [5% for the Republican Primary question]. The total may not round to 100% because of rounding. The polling method was done through IVR, with the raw results weighted by anticipated voting demographics. A full reporting of the cross tabulated results is available upon request. Townhall/Gravis 2016 Iowa poll of 388 Iowa Republican voters surveyed April 13.