The amount of opposition he saw should tell you how seriously the owning class took his candidacy.

This is also his greatest failure. This outcome was inevitable, and Bernie should have seen this coming and been able to co-opt it. Turning hate from the elites into a wave of populism is obvious, but he was blindsided by the centrists coalescing and the reaction from the party elites and donors to his candidacy.

He couldn't full commit to plunging the knife into his co-workers. At the end of the day he just wasn't willing to do what it took to win, and we know centrists will pull out all the stops to beat anyone to their ideological left.