Biden on his own will be unable to do very much at all as President unless the Democrats also take control of the Senate. Republicans currently have a 3-seat majority on the Senate, and Democrats are almost certain to lose a seat in Alabama at this election. Democrats are also at risk of losing Michigan, so that’s the top priority for this election. They also have a good chance of winning seats in Colorado and Arizona:
Michigan
Colorado
Arizona
That would still leave Mitch McConnell running the show, with Democrats well short of a majority in the Senate. It is essential, therefore, that Democrats win additional Senate races. These are the top priority ones:
Montana
Maine
North Carolina
And to be sure of re-taking the Senate, there are three more states where the Democratic challenger still has a good chance of beating the Republican incumbent:
South Carolina
Georgia
Iowa
And for good measure, it would be very nice to push Mitch McConnell out of his own seat in:
Kentucky
Other important Senate races in:
Kansas
Texas
Presidential Battleground States