MN would be tough to crack.
One overlooked state is MA. If widely popular Baker jumps in, then Warren could be in trouble.
Another blue state that could be in trouble is MD if Hogan jumps in, although I doubt he will.
I don't think AZ will be in play at all. NV is the only GOP state I think we could lose.
I think I'm getting hackishness poisoning. Somebody call an ambulance.
There are 11 states with R+ 2016 PVIs and Democratic incumbents in 2018. The filibuster-proof majority is quite likely, and I will be disappointed if we don't get it.