Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, right, speaks as Hillary Clinton, former Secretary of State 2016 and Democratic presidential candidate, center, and Martin O'Malley, former governor of Maryland and 2016 and Democratic presidential candidate, look on during 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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