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UNITED STATES - August 17: Republican presidential candidate and Ohio Governor John Kasich exits a John Deere tractor  after riding it down the concourse at the Iowa State Fair on Tuesday, August 18, 2015 in Des Moines, Iowa. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - August 17: Republican presidential candidate and Ohio Governor John Kasich exits a John Deere tractor after riding it down the concourse at the Iowa State Fair on Tuesday, August 18, 2015 in Des Moines, Iowa. (Photo By Al Drago/CQ Roll Call)

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