Walker is looking better and better, despite the fact I'm loath to lose him as WI governor. With the GOP in the House and the Senate determined for status-quo, and simply spending and expanding the fed.gov how the Democrats would, just a bit slower, and the structural control of Obamacare, and the illegal flood a done deal... I'm not sure any POTUS no matter how perfect can turn the ship around. Triage in the states might be the best we can hope for.
Also, WI went to hell in a handbasket the last time we lost a GOP governor to a Job in D.C. (Thompson to Bush as HHS sec, in 2000...)
Walker's busting and massive fiscal reforms in WI, and weathering the protests and the recall with an even higher margin than his original election it's made him a darling of the Tea Party (what's left of it...) and his dominance in Blue/Purple WI with a lot of the establishment GOP who cares the most about Electoral College bean-counting.
I think it'll come down to if Walker assembles the best team, and that those people are attracted to him because of his big successes against stacked odds here in WI, and it's key position in the EC. A lot of the "big money" Jeb has lined up are promises etc. and checks haven't been signed yet. And that can change through the primary and nomination process.