Eh. If he wins the primary I'll vote for him but he's still a fucking moron. None of his policies have any real substance and every time he and his team try to flesh them out with substance they concoct some of the single worst implementations of policy I've seen a career politician suggest.
There's no tangible proof that it did. Nor was that something agreed upon by the candidates.
And most Bernie supporters went with her in the end.
Her issues were with how her campaign was managed and how she never went to key states.
And the Republican propaganda that was against her for decades.
Can we please stop looking to blame the left for why Hillary lost?
Bernie Sanders very likely did cost Hillary Clinton the Presidency.
His core supporters are far enough left that yes, they did show up.
His campaigning through the rust belt on the same issues as Trump (thinly veiled isolationism most overtly manifested in an opposition to TPP) lured a non-trivial amount of white, working class voters who normally turn out D to either not vote or to vote Trump.
White working class voters in strong union states had their worst D turnout and best R turnout in literally decades. Sanders spent almost a year lobbing anti-establishment Dem bombs to those exact people using lines that sounded straight out of a Trump stump speech.
Then the entire election turns on a few hundred thousand of those people either voting against union interests or just not voting in Wisconsin, Michigan, and Pennsylvania.
The far left core primary supporter showed up. Great. That wasn't where Sanders did damage. He did damage by attacking the "centrist" Dems when the party needed to be united against Trump's isolationist message.
And now the U.S. likely also missed a significant economic win as the rest of the TPP nations have moved on without us. Another example of how he's a fucking moron I might add, as the TPP was a gigantic win for U.S. economic interests.