The only reason Sanders was getting any traction is because there were umpteen other moderate candidates dividing up the majority.
Sanders is a minority loser. Just like Trump was.
The Democrats did the smart thing, unlike the Republicans. The Republicans decided to blow themselves up and follow a maniac who violates every last one of their principles, thus exposing themselves for the profound hypocrites they are.
And BTW - I am surprised at you for supporting this.
The Party establishment would do ANYTHING to avoid a Bernie President.
He would expose the fact that the vast majority of Democrats in Washington are corporatist/globalist. It would force them to vote against his proposals and truly divide the party.
They do not want to be exposed for what they really are.