Sanders and Biden lead Democratic field in South Carolina

Democratic National Committee Chair Tom Perez joins Anderson Cooper to discuss why despite the tightening and contentious race, he thinks the Democrats will come together behind one nominee to try and beat President Trump. Plus, former Obama White House Chief of Staff Rahm Emanuel tells AC360° why he says "panic" is the way to describe the mood in the Democratic party right now. The former Chicago Mayor also explains why he thinks mayors have the most important jobs in politics. Airdate: February 25, 2020

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