2020 Dem Beto O'Rourke drops from presidential race

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2020 Candidate Beto O’Rourke has announced he is dropping out of the presidential race. MSNBC’s Rev. Al Sharpton joins Ari Melber to discuss O’Rourke’s breaking news, a potential impeachment trial weeks away from the Iowa caucus and the fight to hold Facebook accountable for their role with political advertising.