You don't know the whole story of how close we came to one of the deadliest political shootings in US history last year. Roger Williams cannot enjoy fireworks on the Fourth of July anymore. The 68-year-old Texan is a longtime NRA member, but these days, he can’t hunt. Once, during a congressional committee hearing, the chair banged a gavel — clap — on the desk, and Williams fell out of his seat. It’s been almost a year since Williams and nearly two dozen of his Republican colleagues were shot at as they were wrapping up baseball practice in Alexandria, Virginia,...