Rush predicted after Iowa that Gingrich's primary mission now is to sling mud at Romney. I don't like Romney either, but this really underscores that Gingrich is a petty and vindictive egomaniac. Exactly who I don't want sitting in the Oval Office.
He is also doing significant net harm to conservatism by adopting the Left's weapons like this. Because it's all about them as power-hungry individuals, not about advancing conservatism, not about pulling this country back from the Dark Ages of socialism (the very same thing that has brought ruin to Europe).