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MANCHESTER, IA - JANUARY 30:  Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to campaign volunteers during a rally at the Delaware County Fairgrounds January 30, 2016 in Manchester, Iowa. (Photo by Alex Wong/Getty Images)
MANCHESTER, IA - JANUARY 30:  Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to campaign volunteers during a rally at the Delaware County Fairgrounds January 30, 2016 in Manchester, Iowa. (Photo by Alex Wong/Getty Images)

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    Sanders campaign depending on strong new voter turnout

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Sanders campaign depending on strong new voter turnout

Sanders campaign depending on strong new voters turnout. Jeff Zeleny reports.

Sanders campaign depending on strong new voter turnout

Sanders campaign depending on strong new voters turnout. Jeff Zeleny reports.