As the early primaries draw near, Newt Gingrich’s Achilles’ heel could be the millions he was paid by Freddie Mac. Yesterday morning, top rival Mitt Romney called on Gingrich to return the money during a Fox News appearance. For Gingrich, Romney’s request was merely the latest in series of blows since Bloomberg first reported the payments, estimated at $1.6–$1.8 million, in mid-November. “It’s a perfect argument against Gingrich because it ties him to the sleazy practices of the beltway when he is trying to run as an outsider,” observes Larry Sabato, director of the Center for Politics at the University...