I think the lesson from last night for 2020 is that there's only 1 path open to the Dems - the midwest.
Texas is obviously out of play. It always has been and (always?) will be.
Florida is out of reach - neither the moderate white man nor the progressive black man (nor the moderate white woman and right-wing white man of 2016) got through. Arizona is out of play given how wide the governors' margin was.
Ohio is bad. Clinton was washed out. The governor lost today. Sherrod Brown, despite being solidly progressive on most issues, has a lock on the state, but it seems personal rather than policy-based.
It leaves Michigan, Penn, and Wisconsin. All three are doable but difficult. I think they are the only path to victory, and based on conventional knowledge, it will have to be Biden or Bernie that can do it. They need unions mobilised.
At the same time, defend the narrow Clinton wins of New Mexico, NH, Nevada, and Virginia.
I think this map is about as difficult for Dems in 2020 as it was for Trump in 2016.