Plot: Headlines for July 20, 2016; John Nichols: The GOP is More United in Disdain for Hillary Clinton Than in Support for Donald Trump; The Fall of Roger Ailes: Can Sexual Harassment Claims Oust the Biggest Man in Conservative Media; Ban Guns, Not Tennis Balls: As NRA Addresses RNC, CodePink Protests Ohio's Open-Carry Law; Debunking Republican Claims Linking Immigration to Crime; 'Wall Off Trump': Activists Erect Mock Wall Outside RNC to Protest GOP Border & Immigration Policy; Chris Christie Stages Mock Trial of Hillary Clinton Despite Corruption Charges Dogging His Own Staff; Meet the RNC Vendors Selling Trump Gear in Cleveland While Hoping He Loses the Election; Nina Turner: Killing of 12-Year-Old Tamir Rice Highlights Value Gap Between Black & White Lives; Black Activists Occupy Police Union Offices in NYC & D. C