Romney will never sign on, because hes an arrogant slimeball who somehow got elected, probably on the basis of being Mormon, and is now very unpopular. So he doesnt give a darn.
And Collins and Murkowski have been long-time lunatics, so I dont have much hope for them. But Graham has enough, and this just makes Mittens look even sillier and more like a spoiled rich brat pitching a fit.