We all need to keep in mind that the liberal base is essentially the same size as the conservative base.
This whole thing is about solidifying the base and converting enough of the 20% of the wishy-washy in the middle.
Getting the base so worked up that they will crawl over broken glass to vote for any Democrat, no matter how loony he/she is.
Republican turnout had better be darn near 100% or we will lose this.