Bannon is the executive chairman of Breitbart News, the crusading right-wing populist website that’s a lineal descendant of the Drudge Report (its late founder, Andrew Breitbart, spent years apprenticing with Matt Drudge) and a haven for people who think Fox News is too polite and restrained. ... He’s been a naval officer, investment banker, minor Hollywood player, and political impresario. When former Disney chief Michael Ovitz’s empire was falling to pieces, Bannon sat Ovitz down in his living room and delivered the news that he was finished. When Sarah Palin was at the height of her fame, Bannon was whispering in her ear. When Donald Trump decided to blow up the Republican presidential field, Bannon encouraged his circus-like visit to the U.S.-Mexico border. John Boehner just quit as House speaker because of the mutinous frenzy Bannon and his confederates whipped up among conservatives. Today, backed by mysterious investors and a stream of Seinfeld royalties, he sits at the nexus of what Hillary Clinton once dubbed “the vast right-wing conspiracy,” where he and his network have done more than anyone else to complicate her presidential ambitions—and they plan to do more. But this “conspiracy,” at least under Bannon, has mutated into something different from what Clinton described: It’s as eager to go after establishment Republicans such as Boehner or Jeb Bush as Democrats like Clinton.