This is overstated. Bernie ran a lousy and conventional campaign, team was B-minus at the very best. They completely screwed it up, and went out of their way to alienate the very people they needed to win. Not complex at all. https://twitter.com/voxdotcom/status/1248733709177630720

Far too much is made of another primary campaign that flopped. Yes, he's spent almost half a billion dollars now. Maybe it's just the candidate?