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UNITED STATES - August 15: Republican presidential candidate Donald Trump greets fairgoers as he visits the Iowa State Fair in Des Moines, Iowa, on Saturday, August 15, 2015. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - August 15: Republican presidential candidate Donald Trump greets fairgoers as he visits the Iowa State Fair in Des Moines, Iowa, on Saturday, August 15, 2015. (Photo By Al Drago/CQ Roll Call)

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