It happened in 2016. The DNC was all-in for Hillary Clinton, even going so far as providing her campaign the debate questions ahead of time.
HOW DID THAT WORK OUT??? HAAAAAAAAAAAAAAAAAA
http://dcwhispers.com/sanders-supporters-enraged-by-democrat-machines-push-back-all-in-support-of-joe-biden/

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.