RE: did GWB ever admit he was wrong about amnesty?
Well, he ABANDONED the idea.
What if amnesty comes up in the future? Will GWB keep quiet?
I think we can safely say that Obama will use the fact that GOP characters supported leftist ideas once, but even better if they support them long term.
I don't think McCain ever gave up on amnesty, although he may pretend to oppose if it's a Dem initiative. As for Romney, there are so many leftist causes that he supports from time to time....