Evolution only happens is response to a changing environment.

If they think they don't have to change to survive politically, they won't.

This week's election results are a pleasant surprise to Democrats, but to Republicans, they are a stinging rebuke — out of the clear, blue sky. Some are realizing that, if they want to keep getting the free steak, liquor, and companionship from lobbyists three nights a week, they're going to need to adapt.