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UNITED STATES - August 16: Sen. Bernie Sanders, D-Vt., speaks at the Scott County Democrats Picnic in the Park in Eldridge, Iowa, on Sunday, August 16, 2015. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - August 16: Sen. Bernie Sanders, D-Vt., speaks at the Scott County Democrats Picnic in the Park in Eldridge, Iowa, on Sunday, August 16, 2015. (Photo By Al Drago/CQ Roll Call)

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