J. Peder Zane: Democrats in the Grip of Madness

This is basically right.

Though there's a fair bit of gaslighting/strategic lying in there as well.

You've got true believers and you've got those who will say whatever is politically correct despite what they think about its truth. And you've got people in a superposition of those states.

It's no longer two equally sane-but-all-worked-up teams fudging the truth a bit in different directions. Now it's the basically (but by no means entirely) sane team vs. the basically nuts team.