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Democratic presidential candidates Hillary Clinton (L)  and Bernie Sanders (R) participate in the NBC News -YouTube Democratic Candidates Debate on January 17, 2016 at the Gaillard Center in Charleston, South Carolina.. / AFP / TIMOTHY A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Democratic presidential candidates Hillary Clinton (L)  and Bernie Sanders (R) participate in the NBC News -YouTube Democratic Candidates Debate on January 17, 2016 at the Gaillard Center in Charleston, South Carolina.. / AFP / TIMOTHY A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

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    Clinton, Sanders battle for Iowa hearts and minds

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Clinton, Sanders battle for Iowa hearts and minds

With the Iowa caucuses less than two weeks away, Hillary Clinton and Bernie Sanders are campaigning hard for hearts and minds in the Hawkeye state. CNN's Jeff Zeleny reports.

Clinton, Sanders battle for Iowa hearts and minds

With the Iowa caucuses less than two weeks away, Hillary Clinton and Bernie Sanders are campaigning hard for hearts and minds in the Hawkeye state. CNN's Jeff Zeleny reports.