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CEDAR RAPIDS, IOWA - OCTOBER 13:  Iowa Republican State Senator and U.S. Senate candidate Joni Ernst speaks during a rally with former Massachusetts Gov. and GOP presidential candidate Mitt Romney on October 11, 2014 in Cedar Rapids, Iowa. Ernst and Romney met with around 300 supporters at the event, one of many in the final weeks of Ernst's campaign for a U.S. Senate seat. U.S. Representative Bruce Braley (D-IA) and Ernst are virtually tied in polling to replace the seat occupied by retiring U.S. Senator Tom Harkin (D-IA).  (Photo by David Greedy/Getty Images) David Greedy/Getty