H ere’s what happened : On Saturday evening, a man carrying a shotgun, a handgun, and knives got close to the ballroom of the Washington Hilton, where more than 2,000 guests, including the president of the United States, were enjoying the appetizer course at the annual White House Correspondents’ Association Dinner. “I am no longer willing to permit a pedophile, rapist, and traitor to coat my hands with his crimes,” the would-be shooter purportedly wrote in a letter that was apparently written