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UNITED STATES - AUGUST 08: Joni Ernst, Iowa Republican Senate candidate, campaigns with Sen. Charles Grassley, R-Iowa, at the 2014 Iowa State Fair in Des Moines, Iowa, August 8, 2014. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - AUGUST 08: Joni Ernst, Iowa Republican Senate candidate, campaigns with Sen. Charles Grassley, R-Iowa, at the 2014 Iowa State Fair in Des Moines, Iowa, August 8, 2014. (Photo By Tom Williams/CQ Roll Call)

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