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UNITED STATES - August 17: Keira Billings, 10, from West Des Moines, Iowa, is all smiles as she meets Governor of Wisconsin and Republican presidential candidate Scott Walker, 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: Keira Billings, 10, from West Des Moines, Iowa, is all smiles as she meets Governor of Wisconsin and Republican presidential candidate Scott Walker, 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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