Virginia Gov. Ralph Northam says he never even bought his medical school yearbook. He could not have known, therefore, about the racist photo that appeared on his page—of two figures, one in blackface, one in Ku Klux Klan robes—neither of whom, he says, is him. It’s an engagingly feeble defense. Northam admits its weakness, just as he initially admitted being one of the two men in costume before revising his story. On Friday, he declared an intention to hire a private investigator to get to the bottom of the photo.