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An attendee holds up a "We can end gun violence" sign as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, speaks during a town hall meeting at Timberlane Performing Arts Center in Plaistow, New Hampshire, U.S., on Sunday, Jan. 3, 2016. Sanders' presidential campaign on Saturday said it raised more than $33 million in final three months of 2015 with small contributions making up the majority of the donations. Photographer: Andrew Harrer/Bloomberg via Getty Images

An attendee holds up a "We can end gun violence" sign as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, speaks during a town hall meeting at Timberlane Performing Arts Center in Plaistow, New Hampshire, U.S., on Sunday, Jan. 3, 2016. Sanders' presidential campaign on Saturday said it raised more than $33 million in final three months of 2015 with small contributions making up the majority of the donations. Photographer: Andrew Harrer/Bloomberg via Getty Images