Overview: Headlines for April 15, 2016; Clinton & Sanders Debate in Brooklyn, Taking on Social Security, Superpredators, Political Judgment; Juan González: Clinton Has 'Really Distorted' What Happened When NY Daily News Interviewed Sanders; Bernie Sanders: Treating Palestinians with Respect & Dignity Does Not Make Me Anti-Israel; Robert Scheer v. Torie Osborn: A Heated Debate on Sanders vs. Clinton with Two Longtime Progressives; 'No Racism in New York': 1,000 People Rally Against GOP Front-Runner Donald Trump in Manhattan; 'First Amendment Rights!' Two Democracy Now! Journalists Arrested Filming Anti-Trump Rally in NYC