Every party in opposition goes a little crazy. For Republicans in the early Obama era, insanity took the form of the Sarah Palin spasm. Veteran politicos took the former Alaska governor seriously as a national figure. Republican primary voters nominated the likes of Todd Akin, Christine O'Donnell and Sharron Angle. Glenn Beck seemed important enough to hold a big rally at the Lincoln Memorial. Fortunately, serious parties eventually pull back from the fever swamps. That’s what’s happening to the Republican Party. It has re-established itself as the nation’s dominant governing party. Republicans now control 69 of 99 state legislative bodies....