Chump won because he convinced at least a few liberals that he was the agent of change rather than Hillary Clinton. I'm quite sure of this analysis because it came to me directly from their mouths.
It is a vote that deserves respect for the guts it took to make it, considering how far the Chump is from accepted liberal ideals.
The DNC ruthlessly crushed the antiestablishment candidate in a fit of capitulation to its own monied interests, and lost the confidence of its own constituency in the process.
The 90% of us are still here and we are listening. If the Chump was the only one who bothered to speak to us, maybe that's not am indictment of his strategy, but rather of THE ENTIRE REST OF THE POLITICAL ESTABLISHMENT.
In other words, the Chump managed to capture the radical LEFT vote, or at least enough of it to gain victory.