Senate Television via AP

The Democratic Party gained a slim majority in the Senate on Wednesday, when Vice President Kamala Harris — who just a few hours earlier took her own oath of office — swore Sens. Raphael Warnock (D-Ga.), Jon Ossoff (D-Ga.), and her successor Sen. Alex Padilla (D-Calif.) into the upper chamber.

The Senate now has a 50-50 party split, though Harris would serve as the tie-breaker in simple majority votes, which means the Democrats hold the edge.

With the addition of three new Democrats, Sen. Chuck Schumer (D-N.Y.) has taken on the role of majority leader, while Sen. Mitch McConnell (R-Ky.) is once again the minority leader, a post he held between 2007 and 2015.