Similar deal here in the UK with Corbyn, except he was already leader of the party. Destroyed by his own kind. Most politicians accept that the only way into office is to gain control of an existing party. I'm glad for Americans that Bernie Sanders still seems to have some mainstream credibility. Jeremy Corbyn was attacked so hard from all vested interests on all fronts that he has almost become a tragic meme, despite how exceptional he was/is as a figurehead.