Watch out, Romney supporters: Liz Cheney, fresh from badly advising Fred Thompson on foreign affairs, is backing your candidate.  It’s only a matter of time before the cold, creeping touch of Matalin follows and brings political doom with it.  In the endorsement race, McCain has picked up nods from two popular Floridian politicians who endorsed him out of annoyance with Romney’s sleeve-tugging, and Romney has the support of…Liz Cheney.  Those who have proposed that Romney represents some meaningful break with the Bush administration in foreign affairs might want to reconsider that view.