...it's really the establishment trying to take down the ultra establishment president, and the anti establishment folks are rallying to him for some reason (I don't really get it).

Often I think lines can be more easily understood by establishment vs non establishment, and that's KIND of what's happening here, except...

I was considering Schiff to pretty liberal. Pelosi is also really liberal but very establishment.

If you told me those were the battle lines, but I didn't know what the issue was, I'd be really confused.

Weirdly, the split happening on the D side doesn't really follow conservative/liberal lines, as far as I can tell, anyway. Maybe I'm wrong.

But you've got Biden, Coons, AOC and Bernie on one side, and Adam Schiff, Schumar, and Pelosi on the other.