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    Hillary Clinton goes on the attack in Iowa

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Hillary Clinton goes on the attack in Iowa

Hillary Clinton is stepping up attacks on Senator Bernie Sanders as a new poll shows Sanders opening an 8-point lead in Iowa. CNN's Brianna Keilar reports.

Hillary Clinton goes on the attack in Iowa

Hillary Clinton is stepping up attacks on Senator Bernie Sanders as a new poll shows Sanders opening an 8-point lead in Iowa. CNN's Brianna Keilar reports.