ABC News Congressional Correspondent Rachel Scott, reporting from inside Warnock's headquarters on Tuesday night, said the energy in the room was like a "block party."

"The music somehow gets louder, you have a choir singing over my shoulder here," Scott told "ABC News Live Prime" anchor Linsey Davis.

"People in this room, I can tell you Linsey, they are feeling very confident," Scott later reported. "Just moments ago they said, 'We are almost across the finish line.' This race is still too close to call. Big picture, yes it is tight, but the campaign is keeping their eyes on some of those areas ... right around Atlanta where the votes are still being counted right now. They know that if they do well there and those Democratic-leaning areas, they're going to be on track to have a good night."

Amid the tight race so far, here's what percentage of the expected vote remains uncounted in several Democratic-leaning metro Atlanta counties:

DeKalb County: 35%
Fulton County: 33%
Cobb County: 15%
Gwinnett County: 10%

FiveThirtyEight's Nate Silver gives an analysis of the potential Warnock victory: So if the trend here holds, Republicans are going to wind up not picking up even a single Democratic-held Senate seat. That’s pretty hard to do. Even in 1998 and 2002 (relatively bad midterms for the opposition party), they did pick up at least one Senate seat while others flipped in the other direction.

Marc Short, former Vice President Mike Pence's chief of staff, said Tuesday night as vote counting continued that while the race remained close, he expected outstanding ballots from Atlanta and suburban counties to favor Warnock.

"I would anticipate that you'll see Sen. Warnock widen his lead, which if that is the case, I think it's an incredible indictment against the Republican Party in Georgia because we'll have lost three Senate races within two years in a state where Joe Biden currently has a negative 18 approval rating," Short told "ABC News Live Prime" anchor Linsey Davis.

"I think it is an unfortunate circumstance for Republicans if it does unfold the way I anticipate it will over the last 24% of the vote," Short added.

Pressed on whether there should be a party "reckoning" over candidate quality -- an issue that plagued the GOP this cycle despite polling showing voters disproving of Democrats over inflation and crime - Short told Davis: "I think that reckoning is already happening, it began with the midterm results a month ago."

Watch more from Short's appearance on ABC News Live below.

Warnock celebrated his projected victory on Tuesday night in Atlanta, walking out to a crowd chanting "six more years."

"After a hard-fought campaign -- or should I say campaigns? -- it is my honor to utter the four most powerful words ever spoken in a democracy: The people have spoken," Warnock said to cheers.

He thanked the crowd for their support, in particular his mother.

"She grew up in the 1950s in Waycross, Georgia, picking somebody else's cotton and somebody else's tobacco," he said. "But tonight she helped pick her youngest son to be a United States senator."

Warnock called himself a "proud son of Savannah" while discussing his deep roots in the state.

"I am Georgia," he said. "I am an example and an iteration of its history, of its pain and its promise, of the brutality and the possibility."

"But because this is America, because we always have a path to make this country greater against unspeakable odds, here we stand together," he continued.

Warnock said he plans to keep working for all Georgians, including in areas like lowering prescription costs, creating jobs across the state and addressing criminal justice reform.

"I'm ready to keep doing this work," he said in closing. "Let's build a stronger Georgia."