It takes the US House, the US Senate, and the President to be in agreement to make a proposal the law. With Democrats holding the House and soon the Presidency, the Democrats hope of controlling the Senate will come down to Georgia's runoff elections on January 5, 2021.
Democrats would need to win both Georgia's Senate races to split the chamber 50-50, with the vice president (starting in 2021, Democrat Kamala Harris) having the tie-breaking vote. Americans will live with this outcome for two years.
The next round of elections to the U.S. Senate will be held on November 8, 2022, and 34 of the 100 seats are up for regular election. Of the 34 seats up for the 2022 election, Democrats hold 12 seats and Republicans hold 22 of them as of November 2020 according to Ballotpedia.
Senators serve for six years before having to face re-election. Senate seats that are up for re-election in 2022 that were won during the 2016 election with less than a five percent margin of victory can be considered vulnerable to being flipped, or won by the opposite party. Those seats are held by: Roy Blunt (R-M0), Pat Toomey (R-PA), Ron Johnson (R-WI), Catherine Cortez Masto (D-NV), and Maggie Hassan (D-NH). With Toomey and Johnson not running for re-election, their seats can be considered even more vulnerable with their being in states that Joe Biden won.
Dr. Sekou Franklin, Associate Professor of Political Science at Middle Tennessee State University, thinks that Democrats have a better chance of winning in Pennsylvania than in Wisconsin. “Pennsylvania is Biden's childhood home and Democrats have a strong infrastructure there. Even still, the party that is in the White House often struggles in the first mid-term elections after she or he (in this case Biden) is elected. So, I think Republicans have a slight advantage in these states.”