Maybe Bush has in mind a serious fall back position "because of Congressional resistance." The process of "accepting" the much lower level of accommodation for Mexican illegals will have the fringe benefit of separating Hillary! from her political base.
John / Billybob
If George W. Bush were Bill Clinton, I could believe that. That said, he isn't like Bill Clinton at all.
He doesn't do stuff like this for political gain - he does it because he thinks it is the right thing to do. The potential gain for the GOP is mere gravy, but if it were not the right thing to do in the President's mind, he would NOT do it.