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High stakes for Clinton and Sanders going into Sunday’s debate

Sunday night’s primary debate between Hillary Clinton, Bernie Sanders and Martin O’Malley could be their last one –- or at least their last meaningful one.

Democratic presidential candidates Hillary Clinton and Bernie Sanders appear on screens in the media room during the debate held at Saint Anselm College in Manchester, N.H., Dec. 19, 2015. (Photo by Gretchen Ertl/Reuters)
Democratic presidential candidates Hillary Clinton and Bernie Sanders appear on screens in the media room during the debate held at Saint Anselm College in Manchester, N.H., Dec. 19, 2015.REUTERS

Steve Kornacki

Steve Kornacki, author of "The Red and the Blue: 1990s and the Birth of Political Tribalism," is a national political correspondent for NBC News and MSNBC.