I think there's a chance Washington state may go red this year; I remember it flashing red for a second on the Guardian's 2016 electoral map coverage before going blue.
I know this is optimistic wishful thinking but I want Minnesota to go red this year. It's been pretty staunchly blue since the 70's and even went for Mondale in 84. California will never go red at all, but if you want a real bellwether for the future of the Democratic Party, watch Minnesota.
If they somehow go red because of the Minneapolis riots and that helps end in a Trump win then I will be a very happy camper.
I think the two states that might go from blue to red in 2020 compared to 2016 are going to be Minnesota and Virginia.
Minnesota was already trending increasingly purple and red outside the Twin Cities area and it's also possible that the BLM coup might be enough to get a silent majority to go out en masse and vote Republican and if Kanye winds up on the Minnesota ballot somehow then I could see at least a few black voters going for him instead of Biden, especially if Biden gets someone like Kamala or Klobuchar as his VP.
Virginia going red in 2020 will likely be a one-time thing and will probably be meant as a protest vote against Northam, BLM, and the NoVAcrats.
Once again, if Kanye can get on the Virginia ballot before his next depressive episode (given the Virginia deadline is one of the later ones, it's possible) he can probably get enough votes from black Millennials and Zoomers who hate Trump and Biden.
Even if Kanye's completely out of the question, I could see a lot of the blood red counties west of the Fall Line or even the more purple areas west of Richmond/NoVA that are still pissed at the Dems in Richmond to go out and vote red in large enough numbers for Virginia to be in play for 2020 (and maybe 2021 at the state level) but I still think Virginia will trend deep blue from 2022 onward.
The only reason why Minnesota might be in play is because it was already trending purple for most of the 2010's and because of the Minneapolis riots and I think Virginia might not be totally lost this year because Ralph Northam overplaying his hand and the Richmond BLM riots.
If Virginia flips red in 2020 (and 2021 for the state levels) it will be more of a one-time thing and the state will likely keep trending blue but if the impossible happens and Minnesota flips red in 2020, then I think it could very well end up as a perpetual purple state like Florida and Ohio are (as it is, Ohio is turning increasingly red)