When The New York Times runs stories about a former gun lobbyist who has become an expert witness for groups suing gunmakers and dealers, and (some 15 years ago) you were friendly with that guy and his wife, if you're a columnist, you get on the phone, you call the guy, you call people who know the guy and then you write a column on Bob Ricker. To anti-gunners, Ricker is a hero, a whistle-blower who bristled at the gun lobby's zealous resistance to any attempts at reform. To the "gunnies," he's a turncoat. Off the record, some of Ricker's...