The question for conservatives has to be whether we’re willing to destroy every single conservative alternative to Jeb Bush because they’re a heretic on one issue or another. Or in this case, a statement made wasn’t as strong as we would like.
I'm guessing Walker gave a "non-answer" to a loaded question from a reporter seeking to back him into a corner. Happens all the time, especially with the abortion issue.
Getting caught up in a media created "controversy" only works against the real work a person is trying to do. All Walker has to do if he decides to run for president is give one policy speech detailing his stance on illegal immigration and the borders and then refuse to answer any and all "what if" questions pertaining to his already stated beliefs. Same goes for abortion or any other subject the media uses to create controversy in a campaign. Remember, the media never uses this tactic on liberal candidates. It is foolish for conservative candidates to allow themselves to get sucked in.
It is also foolish for people to not recognize political strategy employed by candidates avoiding these pitfalls.