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CEDAR RAPIDS, IOWA - OCTOBER 13:  Former Massachusetts Gov. and GOP presidential candidate Mitt Romney makes his way through supporters of Iowa Republican State Senator and U.S. Senate candidate Joni Ernst 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)
CEDAR RAPIDS, IOWA - OCTOBER 13:  Former Massachusetts Gov. and GOP presidential candidate Mitt Romney makes his way through supporters of Iowa Republican State Senator and U.S. Senate candidate Joni Ernst 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)

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