Newt Gingrich — the friend of his detractors, to whom he offers serial vindications — provided on Monday redundant evidence for the proposition that he is the least conservative candidate seeking the Republican presidential nomination: He faulted Mitt Romney for committing acts of capitalism. Gingrich did so when goaded by Romney regarding his, Gingrich’s, self-described service as a “historian” for Freddie Mac, which paid him more handsomely than anyone paid Herodotus. Romney was asked by an interviewer about the $1.6 million Gingrich earned, or at any rate received, from Freddie Mac, the misbegotten government-backed mortgage giant. In the service of...