Former DNC Chair Howard Dean, a Hillary Clinton supporter, warned on MSNBC this afternoon that Bernie Sanders has to back off his attacks on Clinton in the .brLiberal Radio Host. Social Democrat. Agnostic-Atheist. Secular Humanist. Loyal to the Facts. Principles over Politicians.brFormer DNC Chair Howard Dean, a Hillary Clinton supporter, warned on MSNBC this afternoon that Bernie Sanders has to back off his attacks on Clinton in the .brbrTHIS VIDEO IS FAIR USE UNDER U.S. COPYRIGHT LAW BECAUSE IT IS (1) NON-COMMERCIAL, (2) TRANSFORMATIVE IN NATURE, (3) USES NO MORE .