Families mourn the victims of the D.C. plane crash. Also, NBC News reports two black boxes were recovered on the regional jet. Plus, DNI pick Tulsi Gabbard refuses to condemn Edward Snowden. And Democratic senators grill Trump FBI pick Kash Patel. Capt. Sully Sullenberger, Sen. Tammy Duckworth, Sen. Mark Warner, and Andrew Weissmann join Lawrence O'Donnell.