The post-Labor Day election campaign is underway, and the early conventional wisdom is that Republican hopes of a 2010-style wave are fading. GOP gains in the House could only be a few seats and the six pickups to take the Senate are still uncertain. This is coming from the usual liberal suspects, but it is also whispered by GOP strategists. Maybe Republicans should try to improve their odds by telling voters what they would do if they win.

By any typical political measure, this ought to be a great Republican year. President...