Last week, John Oliver returned with a vengeance – or, at least, a brilliant stunt in which he established the early-morning cable news TV viewing habits of President Donald Trump, then introduced ads he and his staff had written and produced specifically to run on cable news shows in the Washington, D.C. market the next morning. They starred a drawling, friendly, aging cowboy, who, instead of hawking a mail-order type of catheter, was targeting a very specific audience – POTUS himse