Agreed but the president and the GOP congress are seen by many as the face of the GOP. By being on the wrong side of this issue and many other like out of control spending, it will have a dampening effect on GOP turnout - especially in a mid-term election year.
Also, if the national GOP gets it's way and amnesty is granted for the existing illegals, Red states like Georgia could turn Blue overnight.
Then those voters are the real RINO's.