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DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders shake hands at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries. (Photo by Justin Sullivan/Getty Images)

DURHAM, NH - FEBRUARY 04:  Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders shake hands at the start of their  MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.  (Photo by Justin Sullivan/Getty Images)