2020 US Senate Election- Democrats guide to a majority is defeating Trump + 4 GOP US Senators.

Democrats currently has 47 US Senate seats. They only lose 1 Democratic held US Senate seat up in 2020- AL(Jones-R).
Democrats defeat Trump/Pence-R with Sanders/Harris-D. Sanders's home state Governor- Phil Scott-(R-VT) loses re-election in 2020, The Democratic controlled State Legislature of VT prevents Scott-R from appointing Sanders's US Senate Replacement.
Democrats defeat McSally(R-AZ), Gardner(R-CO), Collins(R-ME), and Tillis(R-NC).
McSally(R-AZ) is a weak Republican incumbent facing a strong Democratic Challenger.
Gardner(D-CO) is a weak Republican incumbent in a state that is trending Democratic.
Collins(R-ME) has lost the Moderate Independent vote due to her vote for Kavanaugh.
Tillis(R-NC) represents a US Senate seat that rejects incumbents after 1 term since 2008. Dole-R lost in 2008, Hagan-D lost in 2014, Tillis-R loses in 2020.

Sanders(I/D-VT) US Senate sucessor- Christine Hallquist-D.