Stacey Abrams, former Democratic candidate for governor in Georgia, endorsed Rep. Barbara Lee (D-CA) on Monday, in the heated race to replace retiring Sen. Dianne Feinstein (D-CA).

Lee is in a three-way race to replace Feinstein, 89, who is not seeking another term but has faced renewed calls to resign due to health-related complications. Reps. Katie Porter (D-CA) and Adam Schiff (D-CA) are also in the race to become California's next senator, in what could be the fiercest Democratic primary of the 2024 cycle.

"Honored to be endorsed by the barrier-breaking and inspiring @staceyabrams," Lee tweeted. "Stacey has been instrumental in moving the needle for progress in our country, and I am thrilled to have her support as our team works to bring that same spirit of progress to California, delivering real change and turning progressive policy into law in the U.S. Senate. I'm so grateful to have you on my team, Stacey!"

Schiff, who former House Speaker Nancy Pelosi (D-CA) has endorsed, led his rivals in fundraising during the first quarter. Schiff brought in $6.5 million in April, while Porter's campaign raised $4.5 million, and Lee brought in more than $1.4 million.

Abrams isn't the only well-known Democrat to endorse Lee. Last week Rep. Jim Clyburn (D-SC), a top Pelosi lieutenant, endorsed the California Democrat calling her, "the voice Americans need now in the U.S. Senate." Lee also scored an endorsement from the Congressional Progressive Caucus (CPC) Chairwoman Pramila Jayapal (D-WA). "Barbara is a champion for justice who has been a persistent progressive voice in the U.S. House," Jayapal said of Lee. [MORE]