Out in Phoenix, Arizona, Paul Horner still can't wrap his mind around it. One day he's just a 38-year-old Bernie Sanders fan making up fake news and spreading it far and wide on the Internet, hauling in up to $10,000 a month in ad revenue from phony click-bait stories about gang-rape parties in India and the mascot for a Christian anti-masturbation group being arrested at Sea World for getting it on with itself, along with a bunch of political smoke and mirrors. But then, two weeks ago, the Washington Post reported that his particular line of bull, as promulgated mainly...