Which is why they forced an unpopular, unelected candidate? I don't see it.
The party has evolved an idea that you can do away with those kind of dirty political shenanigans, and construct a rational fact-based proof that will leave voters no choice but to support you, and I think that pretty clearly doesn't work.
Dems will continue to make the mistake of coasting deeper into the right wing, picking up 0 voters in doing so (why would I vote for a "tough on immigration" candidate when I can vote for the one who gleefully promises to deport all the browns?), meanwhile disenfranchising any left wing voters left in the USA and creating no new left wing voter bloc by presenting a coherent alternative to the reactionaries.
The same mistake is being made by neo liberal parties across the world.