A prerequisite for a “rupture” is that there are two competing sides capable of rupturing. But that really isn’t the case in Washington. There aren’t enough GOP moderates in Washington to constitute a side. It’ll take more than Powell and Ridge to create any kind of schism.
The closest thing to a real rupture is this. Some conservatives believe that in races wherein a solidly conservative candidate can’t win, it makes sense to run an occasional deviationist. Other conservatives believe that solid conservatives should be nominated for every race, irrespective of how unlikely it is that a solid conservative could win statewide in, say, Maine. This really is a dispute. You see the pragmatic side of this argument seeming to carry the day in terms of Senate nominees for Connecticut and Delaware. And you see the hardliners backing Pat Toomey in Pennsylvania and this guy Rubio in Florida. But there’s absolutely no chance that the Mike Castles and Rob Simmonses of the world are actually the future of the GOP. The real dispute is over whether or not they’ll be allowed to play at a sidetable.