It was the Democratic establishment and the corporate media that stole it. The biggest thing they fear is a candidate that puts the American people over corporate interests.
See the pattern? Combined with all the "left" side of democrats support for US imperialism.
Bernie and people like him ain't gonna change shit, not any more in the future that they did in a past decades. It's time to radicalise way beyond him and the lukewarm electoral socialdemocracy, the only thing that can change something for the better, and did in the past, is the organised working class.
As much as I hate to say it, Democrats would've just lost even harder if the vote was divided. He did the right thing at the time, the democrat party never would've backed down on Hillary back then.
That entire election was egos that overestimated how things would go.