If Democrats regain control of the US Senate in 2020,

1)Every Democratic held US Senate seat that is up for re-election in 2020 including AL(Jones-D vs Moore-R) remains in the Democratic column. Democrats pickup AZ(McSally-R vs Kelly-D), CO(Gardner-R vs Johnston-D), and NC(Tillis-R vs Cunningham-D) and Democrats win the 2020 US Presidential Election.
2)Democrats lose AL(Jones-D vs Anyone but Moore-R) and pick up AZ(McSally-R vs Kelly-D), CO(Gardner-R vs Johnston-D), GA(Perdue-R vs Tomlinson-D) and NC(Tillis-R vs Cunningham-D). Democrats win the 2020 US Presidential Election.
3)Democrats lose the 2020 US Presidential Election and the 2020 AL US Senate Election. Democrats pickup AZ,CO,GA,NC and ME.