has received broad credit for helping capture the state’s electoral votes for Mr. Biden and the Senate seats for Democrats.

She became a voting rights cause célèbre herself in 2018 after enduring a bitter defeat in a governor’s race marred by accusations of voter suppression against Mr. Kemp in his former capacity as Georgia’s secretary of state. Ms. Abrams has to this day refused to concede defeat; Mr. Kemp, who oversaw the purging of hundreds of thousands of Georgians from the state’s voter rolls during his tenure, denied any wrongdoing. He declined to comment for this article.

Ms. Abrams said that Republicans could not match the political energy and the demographic momentum that have propelled Democrats in Georgia, other than to pursue laws that would make it harder for traditional Democratic constituencies, such as African-Americans, to vote.

The legislation currently making its way through the Capitol includes strict limits on weekend voting, a measure that could significantly impede the traditional role of Black churches in fostering civic engagement. A bill that passed the Georgia Senate early this month would repeal “no-excuse” absentee voting and require more stringent voter identification measures. The state’s political patriarch, the 96-year-old former President Jimmy Carter, said this past week that he was “disheartened, saddened and angry” about the legislation.

the civil rights pioneer and Georgia congressman John Lewis, became the first Jewish senator from the Deep South and entered the chamber with first Black senator to represent Georgia, Mr. Warnock. He now sits at a Senate desk that was once occupied by the fierce civil rights opponent Richard Russell and the staunch segregationist Herman Talmadge. In accordance with Senate tradition, both long-dead senators carved their initials in the desk, though Mr. Ossoff said he had yet to do that himself.

Georgia Republicans say it would be shortsighted to think that legislation alone can stem the state’s recent tide of red to blue. Nor is it clear whether the most powerful motivating force in their party — Mr. Trump — has in fact motivated just as many voters to support Democrats in and around Atlanta.

This dynamic has extended to Trump acolytes like Representative Marjorie Taylor-Greene, the first-term Republican from the state’s northwest corner, whose far-right views, incendiary language and promotion of conspiracy theories have made her the biggest new attention magnet in Congress, for better or worse. “I have always subscribed to having a big tent,” Mr. Chambliss said. “By the same token, I don’t know where some of these people who wander into the tent ever come from.”

Former Senator Kelly Loeffler, the Republican businesswoman whom Mr. Kemp appointed to replace the retiring Johnny Isakson in late 2019, announced plans last month to start a voter registration group of her own, geared toward disengaged conservatives. Ms. Loeffler, who lost to Mr. Warnock, envisions the organization, Greater Georgia, as a Republican counterbalance to Ms. Abrams’s efforts.

Ms. Loeffler said she had committed a seven-figure sum of her own money to seed the effort. “When I stepped out of the Senate, I heard people say consistently that ‘someone needs to do something about Georgia,’” Ms. Loeffler said.

brief foray into elective politics began in January 2020, during Mr. Trump’s first Senate impeachment trial. She immediately began running for her November re-election, in a campaign that included Representative Doug Collins, a firebrand Republican and fierce defender of Mr. Trump who continually derided Ms. Loeffler as a “RINO” (Republican in name only) who was not adequately devoted to the former president. She then spent much of her brief Senate career trying to display her fealty to Mr. Trump — an effort that included a campaign ad literally portraying her as to the right of Attila the Hun.

Ms. Loeffler, 50, said she had no timetable for deciding whether she would run against Mr. Warnock in what would be a rematch for her old seat. As for what other Republicans might run, speculation has produced (as it does) a colorful wish list, from Ms. Greene to Mr. Walker. David Perdue, the former Republican senator who was defeated by Mr. Ossoff, said last month that he would not run in 2022, and Mr. Trump has been trying to enlist Mr. Collins to take on Mr. Kemp in a Republican primary bid.

Mr. Walker, the 1982 Heisman Trophy winner, signed his first professional football contract in the ’80s with Mr. Trump’s United States Football League team, the New Jersey Generals, and maintains a close friendship with his former boss. A native of Wrightsville, Ga., Mr. Walker is a Republican who has encouraged African-Americans to join the party, and he has not ruled himself out for 2022.

He is also unquestionably beloved in his home state, and the feeling appears to be mutual, though Mr. Walker currently lives in Texas.

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