Cedar Rapids

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Democratic presidential candidate and former Maryland Gov. Martin O'Malley speaks during the Iowa Democratic Party's Hall of Fame dinner in Cedar Rapids, Iowa, on July 17, 2015. (Associated Press) **FILE**

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Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a town hall meeting, Friday, July 17, 2015, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

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Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a town hall meeting, Friday, July 17, 2015, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

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Texas Gov. Rick Perry, center, speaks to local residents while campaigning for 1st Congressional District candidate Rod Blum, right, Tuesday, Sept. 2, 2014, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall) **FILE**

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Emma Nemecek, of Mt. Vernon, Iowa, listens as former Republican presidential nominee Mitt Romney speaks during a rally for Iowa Republican Senate candidate Joni Ernst, Friday, May 30, 2014, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

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Former Republican presidential nominee Mitt Romney greets supporters before speaking at a rally for Iowa Republican Senate candidate Joni Ernst, Friday, May 30, 2014, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

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Former Republican presidential nominee Mitt Romney greets supporters before speaking at a rally for Iowa Republican Senate candidate Joni Ernst, left, Friday, May 30, 2014, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

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FILE - In this May 31, 2013, file photo, sandbags are piled around the Parlor City Pub and Eatery in Cedar Rapids, Iowa, where workers placed a cardboard cutout of a man drinking beer. Congress is on the cusp of passing its first infrastructure bill of the year. The Senate is expected to vote Thursday, May 22, 2014, on a $12.3 billion water resources bill that authorizes 34 water projects, from managing flood risks in Cedar Rapids, Iowa, and environmental restoration in Louisiana to dredging Boston Harbor. (AP Photo/Ryan J. Foley, File)