My take? As long as the Republicans stand for something and the Democrats for nothing, some of those in the middle will side with the obstructionists. But when the Democrats are forced to adopt a positive agenda, they lose, unless they themselves move to the center.
Will Democratic candidates make centrist noises? No doubt. Will the base and the donors actually put up with a concrete centrist campaign platform? Doubt. Will Republicans let the Democrats get away with only paying lip service to centrist positions? Let’s hope not.