Barack Obama’s valedictory speech, which mused on the fragile nature of American democracy, was soon drowned out by reports that Russia holds salacious footage of Donald Trump to use as blackmail. The claims are unsubstantiated, but here the gulf between the two men was laid bare. One, a poet and a philosopher who now jokes about youthful love letters in which he quoted Foucault and Fanon; the other, a bully and a boor who once claimed his celebrity status let him grab women “by the pussy”. Mr. Obama leaves the White House without a single personal scandal to his name. Mr. Trump enters buried under them.