And why is the Virginia General Assembly solidly Republican?
Probably because its not up for election in 2018? Anyway, I don't disagree with these ratings too much, though I would probably shift MN House and NY Sen 1 category Left, and FL House one category right. He also notes the IDC are still around...even though the faction basically died in the primary.
Something to watch in a few weeks will be Michigan since the Wave seems to be crashing hard there (for obvious reasons) and as he notes, the chamber might go from Pub Trifecta to Dem Trifecta.