On Thursday evening, precisely 49 days, five hours and 11 minutes after Barack Obama was no longer the president of the United States, the conspiracy-enthusiastic site Gateway Pundit posted a new story: "Breaking: Malik Obama Tweets Alleged Barack Obama Birth Certificate In Kenya" Gateway Pundit never met an anti-Obama or anti-Hillary-Clinton story that it didn’t like. On any number of occasions, the site’s articles have been demonstrably false, as collated by the liberal watchdog group Media Matters. Despite that — or perhaps because of its ferocious defenses of then-candidate Donald Trump over the course of 2016 — an employee of...