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O'Donnell to Trotter: 'You don't go to the Senate to imagine things!'

20:29

MSNBC's Lawrence O'Donnell still had questions after Wednesday's Senate Judiciary Committee hearing on President Obama's proposed gun control legislation- so he reassembled two key witnesses today, Baltimore County Police Chief Jim Johnson and gun rights activist Gayle Trotter, along with a mental health expert, psychiatrist Dr. Richard Friedman.