here is a case to be made that the media created Donald Trump. It was, reportedly, his anger at being dismissed by political pundits that led him to run for president in the first place. And it was, arguably, the media’s wall-to-wall coverage of his every utterance that powered his victory in the Republican primary. But slowly, surely, the media has turned on Trump. He still gets wall-to-wall coverage, but that coverage is overwhelmingly negative. Increasingly, the press doesn’t even pretend to treat Trump like a normal candidate: CNN’s chyrons fact-check him in real time; the Washington Post reacted to...