Don't laugh. He has built-in advantages in Iowa and New Hampshire, a party moving in his direction, and formidable fundraising potential. If Chris Christie was ever the frontrunner for the 2016 Republican presidential nomination, he isn’t anymore. All along, the theory behind his candidacy was that he could overcome his lack of conservative bona fides with a combination of personality, competence, electability, and money. Bridgegate undermines all four. In the minds of many voters, Christie’s personality has morphed from brash to bully. It’s harder to look competent when your top aides egregiously abused power under your nose. Christie’s supposed electability...