In the face of McCain's accusations of flip-flopping on immigration, Mitt Romney today opted for the roll-your-eyes-and-chuckle instead of the counterpunch. Speaking briefly with reporters in Dallas this afternoon, Romney responded with a laugh to McCain's "shoot the Guatemalans off his lawn" potshot -- which McCain liked enough to repeat to television cameras again last night in Oklahoma City."I guess it just shows that, even when he's wrong, he's amusing," Romney replied. He went on to defend himself against charges that he's inconsistent on immigration, ticking off the tough-on-illegals policies he promoted as Massachusetts governor. But he noticeably deferred when the press fished for a direct critique of the compromise bill hobbled together by the President and Congress earlier this week. "I'm not in the position to make that call today."