Overview: Headlines for March 16, 2016; Donald Trump & His Enablers: John Nichols Calls Out Trump-Obsessed Media for Wall-to-Wall Coverage; Hillary Clinton Has Big Night; Media Moves to Silence Bernie Sanders Campaign; John Nichols: GOP Threats to Block Supreme Court Nominee are Wrong & Absurd; North Carolina Voter ID Law Takes Effect, Disproportionately Bars Blacks, Young People from Polls; Dream Defenders Launch #SquaDD2016 'Presidential' Campaign: 'We're Black, Brown, Radical & Tired as Hell'