Des Moines

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Vice President Joe Biden stopped for a cup of coffee and to chat with Iowans at Smokey Row Coffee Shop, Thursday, Feb. 12, 2015, in Des Moines, Iowa, following his speech at Drake University. (AP Photo/The Des Moines Register, Bryon Houlgrave) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT

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7. IOWA $2.046/GALLON - This July 10, 2014 photo shows the free downtown shuttle moving through the historic East Village district, in Des Moines, Iowa. Nestled in the middle of Iowa, surrounded by miles of rolling hills green with corn and soybeans, is the capital city of Des Moines. A metropolis thatâ€™s experienced a popularity surge in recent years thanks to new businesses and housing opportunities, Des Moines has plenty of activities that will be kind to your wallet. (AP Photo/Charlie Neibergall)

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New Jersey Gov. Chris Christie speaks during the Freedom Summit in Des Moines, Iowa, in this Jan. 24, 2015, file photo. (AP Photo/Charlie Neibergall)

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Former Texas Gov. Rick Perry pumps his fist as he walks on stage during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Former Hewlett-Packard chief executive Carly Fiorina and Wisconsin Gov. Scott Walker were seen as doing the best of improve their position among voters at the Freedom Summit in Des Moines, Iowa. Saturday.

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Former Arkansas Gov. Mike Huckabee waits backstage before speaking during the Freedom Summit in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Dr. Ben Carson speaks during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Carly Fiorina waves after speaking at the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Former Texas Gov. Rick Perry pumps his fist as he walks on stage during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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U.S. Sen. Ted Cruz, R-Texas, waves before speaking at the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall) ** FILE **

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Wisconsin Gov. Scott Walker gestures after speaking at the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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U.S. Sen. Ted Cruz, R-Texas, waves before speaking at the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Donald Trump speaks during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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U.S. Sen. Mike Lee, R-Utah, speaks during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Rep. Steve King, R-Iowa speaks during the Freedom Summit, Saturday, Jan. 24, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Wisconsin Republican Governor Scott Walker is one of 23 potential GOP presidential hopefuls heading to the Iowa Freedom Summit in Des Moines on Saturday to test their messages. (Associated Press)

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Iowa Gov. Terry Branstad kisses his wife Chris, right, after taking the oath of office during inauguration ceremonies, Friday, Jan. 16, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Iowa Republican Party members listen during a Jan. 10, 2015, meeting at the party headquarters in Des Moines to discuss whether the state party should carry on with a presidential straw poll. Despite criticism from some prominent Republicans, the Republican Party of Iowa's central committee unanimously voted to keep the event going. (Associated Press/The Des Moines Register, Charlie Litchfield) **FILE**