Voting rights advocate and former Georgia gubernatorial candidate Stacey Abrams (D) on Thursday endorsed Atlanta pastor the Rev. Raphael Warnock for Senate, the same day he announced his 2020 candidacy for the seat vacated by Sen. Johnny Isakson Johnny IsaksonGeorgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Loeffler: Trump 'has every right' to fill Ginsburg vacancy before election Bottom line MORE’s (R) retirement.

“Reverend Raphael Warnock is a true ally in our fight for justice,” Abrams tweeted, quote-tweeting Warnock’s announcement video. “That’s why I'm proud to endorse him for U.S. Senate here in GA.”

ENDORSEMENT TWEET: Reverend Raphael Warnock is a true ally in our fight for justice. That’s why I'm proud to endorse him for U.S. Senate here in GA. Take a moment to get to know him & if you can, chip in to support his campaign: https://t.co/c9tkvgYL2m #gasen #gapol https://t.co/GLyO5yKjmy — Stacey Abrams (@staceyabrams) January 30, 2020

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The endorsement comes as a fight for the Republican nomination is brewing, with Rep. Doug Collins Douglas (Doug) Allen CollinsVulnerable GOP incumbents embrace filling Supreme Court seat this year Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Win by QAnon believer creates new headaches for House GOP MORE (R-Ga.), who emerged as one of President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s most vocal defenders in the House’s impeachment hearings, announcing he will challenge Sen. Kelly Loeffler Kelly LoefflerMcConnell locks down key GOP votes in Supreme Court fight Trump supporters chant 'Fill that seat' at North Carolina rally Vulnerable GOP incumbents embrace filling Supreme Court seat this year MORE (R), who Gov. Brian Kemp (R) appointed to the seat to fill the seat earlier this month.

Abrams also sent out a fundraising email touting Warnock on Thursday, according to Politico, praising his leadership on "issues of social justice, economic access and voting rights."

"Georgia deserves a proven leader like Raphael Warnock — a son of South Georgia who knows our state inside and out — he’s traveled its highways, visited its towns and served its people for decades,” the fundraising email adds.

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A special election to complete Isakson’s term, which was to end in 2023, will be held in November, with all candidates of all parties competing and a runoff set for January 2021 if no candidate achieves a simple majority. Abrams has declined attempts by state Democrats to run against either Loeffler or Sen. David Perdue (R-Ga.), who is also up for reelection.

Abrams is the latest of several high-profile Democrats to endorse Warnock, including Sens. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.), but the highest-profile figure in Georgia Democratic politics so far.

"Some might ask why a pastor thinks he should serve in the Senate," Warnock, the senior pastor at Atlanta’s historic Ebenezer Baptist Church, said in his announcement. "Well, I've committed my whole life to service and helping people realize their highest potential. I've always thought that my impact doesn't stop at the church door. That's actually where it starts."