No gun-suit immunity, no assault-weapons ban. In a dramatic, almost wacky turn of events, the Senate overwhelmingly rejected S. 1805, a bill earlier this month that would have immunized firearm manufacturers and dealers against many forms of tort liability. The bill's own sponsors turned against it, as did its original NRA supporters, after opponents succeeded in adding two "poison pill" amendments — one extending a soon-to-expire ban on so-called assault weapons, and another closing an alleged "gun-show loophole" for unregulated sales of firearms. Pro-gun and anti-gun groups seemed equally disappointed. The NRA had lobbied long and hard for tort immunity,...