Let Federalism work. I think Walker is best poised to encourage Federalism. We have 24 states under 100% GOP control that account for 50% of the US population, IIRC. Let them run with the ball.
I like him a lot but for his flakiness with respect to immigration and a few other things GOPe. What he's done in Wisconsin is remarkable. The man has backbone and the intelligence to pick battles he can win, each leaving him in a better position for the next. It's a talent Bush II lacked totally.