US Senate seats Democrats must win in November 2020 to have majority control in January 2021.

[nkpolitics1212]

If Sanders is the 2020 Democratic Presidential Nominee and gets elected.
35)RI(Reed-D)
36)MA(Markey-D)
37)NJ(Booker-D)
38)IL(Durbin-D)
39)DE(Coons-D)
40)OR(Merkley-D)
41)VA(Warner-D)
42)NM(Lujan-D)
43)MN(Smith-D)
44)NH(Shaheen-D)
45)MI(Peters-D)
46)CO(Hickenlooper-D)
47)AZ special(Kelly-D)
48)NC(Cunningham-D)
49)ME(Gideon-D)
50)GA special(Warnock-D)
51)GA regular(Tomlinson-D)
If Biden is the 2020 Democratic Presidential Nominee and gets elected.
36)RI(Reed-D)
37)MA(Markey-D)
38)NJ(Booker-D)
39)IL(Durbin-D)
40)DE(Coons-D)
41)OR(Merkley-D)
42)VA(Warner-D)
43)NM(Lujan-D)
44)MN(Smith-D)
45)NH(Shaheen-D)
46)MI(Peters-D)
47)CO(Hickenlooper-D)
48)AZ special(Kelly-D)
49)NC(Cunningham-D)
50)ME(Gideon-D)
51)GA special(Warnock-D)