If 2020 US Presidential and Senate Elections are like 2016- straight party voting.

Democrats will win US Presidential Elections in all of the states Clinton won in 2016.
Democrats will win US Senate Elections in:
CO(Hickenlooper-D) 36
DE(Coons-D) 37
IL(Durbin-D) 38
ME(Gideon-D) 39
MA(Markey-D) 40
MN(Smith-D) 41
NH(Shaheen-D) 42
NJ(Booker-D) 43
NM(Lujan-D) 44
OR(Merkley-D) 45
RI(Reed-D) 46
VA(Warner-D) 47
If Democrats win the 2020 US Presidential Election and regain control of the US Senate, they need to win
AZ special(Kelly-D) 48
MI(Peters-D) 49
NC(Cunningham-D) 50