"The Purest Socialist in Mainstream American Politics Was No Longer Pure Enough"

"But it wasn't good enough, he said, because of Sanders’s choice of tactics: He was running as a Democrat. Which meant that he could lose and deliver his voters to Hillary Clinton, a mainstream Democrat with ties to Wall Street and big business. Deliver them to the system they all wanted to defeat.

"'Warts and all, the [Sanders] campaign has a lot going for them,' Ramey said. 'But the Democratic Party is not a wart.' It is a fatal flaw, he said."

David A. Fahrenthold in The Washington Post visits socialists in Vermont who won't support Bernie Sanders.