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Sen. Kamala Harris joins 2020 race as the field grows


Senator Kamala Harris has thrown her hat in the ring for the 2020 presidential election. Hallie Jackson discusses 2020’s latest hopeful and how other contenders are making appearances around the country to honor Dr. Martin Luther King, Jr. Weighing in: NBC News Senior Politics Editor Mark Murray, Texas Tribune Washington Bureau Chief, Abby Livingston, Bloomberg White House Reporter Toluse Olorunnipa, and former White House Deputy Chief of Staff Jim Messina