Lost in the weekend’s back-to-back debates in New Hampshire was this illuminating remark by Democratic strategist Donna Brazile after Saturday night’s soporific contest in Manchester: “Mitt Romney won tonight because no one touched him. And for Democrats, you know what? It was good news for us . . . because we believe that the weakest candidate is the candidate that the Republicans are not attacking. And that’s Mitt Romney.” The remark drew guffaws from some of the other assembled party faithful and media commentators, but Brazile spoke the truth. Democrats do believe that Romney is eminently beatable, the perfect foil...