Mike Huckabee

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Republican presidential candidate, former Arkansas Gov. Mike Huckabee, center, speaks to supporters during a fundraiser for U.S. Sen. Joni Ernst, R-Iowa, Saturday, June 6, 2015, in Boone, Iowa. (AP Photo/Charlie Neibergall)

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In this Jan. 24, 2015, file photo, former Arkansas Gov. Mike Huckabee speaks in Des Moines, Iowa. (AP Photo/Charlie Neibergall, File)

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Republican presidential candidate and former Arkansas Gov. Mike Huckabee addresses attendees during Rick Scott's Economic Growth Summit in Lake Buena Vista, Fla., on June 2, 2015. (Associated Press)

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Republican presidential candidate and former Arkansas Gov. Mike Huckabee speaks in Scottsdale, Ariz., in this May 15, 2015, file photo. (AP Photo/Ross D. Franklin, File)

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FILE - In this May 15, 2015 file photo, Republican presidential candidate and former Arkansas Gov. Mike Huckabee speaks in Scottsdale, Ariz. Huckabee says he won't participate in the Iowa Straw Poll, where he competed and placed second eight years ago. In an opinion piece published Thursday in The Des Moines Register, Huckabee said his resources are better spent on other efforts. He argued that the straw poll is likely to draw only conservative candidates and that the competition could weaken them. (AP Photo/Ross D. Franklin, File)

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Republican presidential candidate and former Arkansas Gov. Mike Huckabee speaks at the Republican National Committee spring meeting luncheon in Scottsdale, Ariz., on May 15, 2015. (Associated Press) **FILE**

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Mike Huckabee

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In this May 5, 2015, photo, former Arkansas Gov. Mike Huckabee speaks to supporters in Hope, Ark., as he announces that he is seeking the Republican nomination in the 2016 race for president. Hillary Rodham Clinton starred in two presidential campaign launches this week. Neither was her own. The leading Democrat was featured prominently by Huckabee and former technology executive Carly Fiorina, whose road to relevancy in 2016 may be inextricably tied to the former first lady.(AP Photo/Danny Johnston)

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Former Arkansas Gov. Mike Huckabee speaks to supporters in Hope, Ark., Tuesday, May 5, 2015. Huckabee announced that he is seeking the Republican nomination in the 2016 race for president. (AP Photo/Danny Johnston)

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Former Arkansas Gov. Mike Huckabee waves to supporters in Hope, Ark., Tuesday, May 5, 2015, after he announced that he is running for the Republican presidential nomination. Huckabee pitched himself Tuesday as the best GOP candidate to take on Democratic favorite Hillary Rodham Clinton. (AP Photo/Danny Johnston)

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FILE - In this April 18, 2015 file photo, former Arkansas Republican Gov. Mike Huckabee speaks at the Republican Leadership Summit in Nashua, N.H. Huckabee is set to announce he will seek the 2016 Republican presidential nomination. He has an event planned for May 5 in his hometown of Hope, Ark., where former President Bill Clinton was also born. (AP Photo/Jim Cole, File)

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Former Arkansas Governor Mike Huckabee speaks at the Iowa Faith & Freedom 15th Annual Spring Kick Off, in Waukee, Iowa, Saturday, April 25, 2015. (AP Photo/Nati Harnik)

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Former Arkansas Republican Gov. Mike Huckabee speaks at the Republican Leadership Summit in Nashua, N.H., in this April 18, 2015, file photo. (AP Photo/Jim Cole, File)

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A Quinnipiac University poll released Thursday showed Sen. Rand Paul performing better against Hillary Rodham Clinton in Iowa and Colorado, both swing states, than did Mike Huckabee, former Florida Gov. Jeb Bush, Sen. Marco Rubio of Florida and Wisconsin Gov. Scott Walker. (Associated Press)