Bernie got fukked by his own party, the media, and large corporations.
Whoever says it's because he had no 'black agenda' or 'his ideas were too ambitious' are disingenuous because first no other serious candidate had a 'black agenda', southern blacks voted for biden because he goes to church and was Obama's token white guy. Second, you vote for a candidate because you like their agenda. You give them a chance at the presidency and let them shoot their shot. If they miss badly you come back and say okay this wasn't smart or you could simply put pressure on your politicians to lean more left to get things that benefit us. If people had this mentality of not voting for candidates with ambitious ideas we'd probably still be in chains.