Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, speaks as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, listens during the Democratic presidential candidate debate at the University of New Hampshire in Durham, New Hampshire, U.S., on Thursday, Feb. 4, 2016. Clinton and Bernie Sanders each tried to establish their credentials as progressives as they vied for the votes of Democrats and independents in next week's New Hampshire primary. Photographer: Andrew Harrer/Bloomberg via Getty Images