Walker does not appear to be a zealot on Common Cause and amnesty, could be convinced to take the right position. This is unlike Bush who is fanatical about amnesty and made it clear he will not change his position.
Fwiw, there's no way I'd vote for Jeb Bush or Chris Christie and it wouldn't matter what they're running for or who or what they're running against.
I do respect and like Walker's background and success so far, but I'm too jaded by past experience to care about compromise that much any more.
The most recent election and all that's happened since has been an eye opener.