Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, left, speaks to Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, after the Democratic presidential candidate debate in Charleston, South Carolina, U.S., on Sunday, Jan. 17, 2016. Hours before Sunday's Democratic debate, the two top Democratic contenders held a warm-up bout of sorts in multiple separate appearances on political talk shows, at a time when the polling gap between the pair has narrowed in early-voting states. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
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