Body language expert Janine Driver examines a tense exchange between Sens. Warren and Sanders after the January Democratic debate.

FULL PBS Democratic Debate P5 Hillary Clinton VS Bernie Sanders Feb. 11, 2016 (6th Dem Debate)

FULL PBS Democratic Debate P1 Hillary Clinton VS Bernie Sanders Feb. 11, 2016 (6th Dem Debate)

FULL PBS Democratic Debate P4 Hillary Clinton VS Bernie Sanders Feb. 11, 2016 (6th Dem Debate)

FULL PBS Democratic Debate P7 Hillary Clinton VS Bernie Sanders Feb. 11, 2016 (6th Dem Debate)

FULL PBS Democratic Debate P2 Hillary Clinton VS Bernie Sanders Feb. 11, 2016 (6th Dem Debate)

Sarah Sanders' Tweet Mocking Hillary Clinton May Have Violated Hatch Act

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Bernie Sanders attacks Clinton at NBC debate

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Bernie Sanders Called Out Ted Cruz’s Corruption at CNN's Debate

Ted Cruz and Bernie Sanders' Debate over Obamacare

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