Maybe he saw the flak Rubio was getting...who knows? Regardless, he openly advocated for it; he's not trustworthy.
Also, re:your post #45---Hispanics overwhelmingly support Democratic issues and vote for Dem candidates. There was a thread here which showed that they are no more likely to vote for Rubio than they were before he made a fool of himself over amnesty. Also, I believe Scott Walker denies that he backtracked on the issue.
We all know the reality of how Hispanics would vote but nonetheless, this issue has been used supposedly to scare some Republicans and that is why some would be supporting the immigration bill because 14 Republican Senators did, I believe all of the Republican Senators from Utah, a state near the border or Arizona which is on the border.
http://washingtonexaminer.com/walker-i-have-not-endorsed-the-senate-immigration-bill/article/2532724
Gov. Walker has had to deal with this immigration bill in interviews only. I would assert he did not have a good understanding of the situation being from Wisconsin. This is another problem. The above link does indeed show a bit of backtracking on the issue if one hunts down the original interviews.
http://blogs.wsj.com/washwire/2013/07/03/wisconsins-scott-walker-backs-senate-immigration-bill/
So, I’m not going to give up on him totally if he said one thing earlier and now may have a bit of a different view. He’s not voting on it himself and may have been swayed by Rep. Ryan.