New Jersey Senator Cory Booker announces run for president

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The 2020 race is widening once again with New Jersey Senator Cory Booker officially in the fight for the Democratic nomination, joining an already crowded field. Stephanie Ruhle breaks down the latest on the new candidate. Weighing in: NBC News National Political Correspondent Steve Kornacki, former Governor Christie Todd Whitman, Sirius XM Progress Radio Host Mark Thompson, and NBC News Senior Politics Editor Beth Fouhy.