On Fox News last night, Mitt Romney dismissed Rick Santorum’s “Rombo” ad, which features a Mitt Romney look-alike shooting mud at a cardboard cutout of a smiling Santorum, as the “the most negative ad I’ve seen, so far,” per GOP12. “Look, it’s not something I’m going to whine about,” Romney added. “I know there’s some candidates that want to whine about the fact that you go back-and-forth and talk about the distinctions between one another.”