Mitt Romney, this is your fault. Maybe it’s not all on your head, but as we survey the impending Republican disaster here, your name is at the top of a very short list of suspects. Poor Kerry Healey. Perhaps she should have told you she wasn’t an Irish Catholic before you picked her as your running mate, but that was four years ago now. We all know it’s a Mitt Romney world, but still, couldn’t you have thrown her a few second-tier assignments? She never got a chance to define herself, because you never let her up for air. So...