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MILWAUKEE, WI - FEBRUARY 11:  Democratic presidential candidates Senator Bernie Sanders (L) and Hillary Clinton participate in the PBS NewsHour Democratic presidential candidate debate at the University of Wisconsin-Milwaukee on February 11, 2016 in Milwaukee, Wisconsin.The debate is the final debate before the Nevada caucuses scheduled for February 20.  (Photo by Win McNamee/Getty Images)
MILWAUKEE, WI - FEBRUARY 11:  Democratic presidential candidates Senator Bernie Sanders (L) and Hillary Clinton participate in the PBS NewsHour Democratic presidential candidate debate at the University of Wisconsin-Milwaukee on February 11, 2016 in Milwaukee, Wisconsin.The debate is the final debate before the Nevada caucuses scheduled for February 20.  (Photo by Win McNamee/Getty Images)

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Clinton paints herself as Obama's BFF in debate

CNN's Sunlen Serfaty reports.