What state should democrats be most worried about in 2020?

[Xing]

I'd be the most worried about Pennsylvania. It's going to be very hard for a Democrat to win without Pennsylvania, whereas states like Arizona, Ohio, and Florida are obviously not must-wins for a Democrat. Wisconsin is also a state that Democrats can't take for granted, but unlike the majority of Atlas, I think it's slightly more likely to flip back than Pennsylvania, and while it's unlikely that the Democrats win without Wisconsin, it's more plausible than winning without Pennsylvania, which would pretty much mean that they would have to win Florida, or I guess winning AZ/MI/NE-02/WI would just barely do it.