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UNITED STATES - August 17: Governor of Wisconsin and Republican presidential candidate Scott Walker, greets a worker at the Iowa Pork Producers Association site at the Iowa State Fair in Des Moines, Iowa, Monday, August 17, 2015. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - August 17: Governor of Wisconsin and Republican presidential candidate Scott Walker, greets a worker at the Iowa Pork Producers Association site at the Iowa State Fair in Des Moines, Iowa, Monday, August 17, 2015. (Photo By Al Drago/CQ Roll Call)

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