Mitt wont have a Conservative vote to do this so that wont be an issue in his possible presidency of 8 years.
Barry Ohs backing down on the UN Treaty is directly because he finally realized that his base isnt enough to get him elected again. Its shrunk in the last 2 years and he's just now realizing how important the 2A and a few of the other amendments are to an awful lot of folks. I hope he regains nothing by this move, he and Hillary designed it, Im certain he found nothing wrong with it at all.
Mitts not stupid, hes not going to throw himself on this sword.