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Democratic presidential candidate U.S. Sen. Bernie Sanders (I-VT) speaks at the Des Moines Register Soapbox at the Iowa State Fair on August 15, 2015 in Des Moines, Iowa.
Democratic presidential candidate U.S. Sen. Bernie Sanders (I-VT) speaks at the Des Moines Register Soapbox at the Iowa State Fair on August 15, 2015 in Des Moines, Iowa.

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    Sanders popularity and poll numbers grow in Iowa

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Sanders popularity and poll numbers grow in Iowa

Democratic candidate Hillary Clinton leads in an Iowa poll, but Berne Sanders is only 7 points behind. CNN's Joe Johns has mote.

Sanders popularity and poll numbers grow in Iowa

Democratic candidate Hillary Clinton leads in an Iowa poll, but Berne Sanders is only 7 points behind. CNN's Joe Johns has mote.