If John Travolta, an avid user of his private jet and a reported Republican, were to be stopped by law from purchasing an armed fighter plane, would the film actor suddenly be surrounded by the same people who sanctimoniously claim that the Constitution protects the private citizen's right to buy and own an assault rifle? That seems an absurd question, but we often find ourselves in absurd circumstances when we get to the gun issue. A hard fact leers before us: on the subject of guns, constitutional meaning and misinterpretation have been mixed together for so long that far too...