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.

ABC News Congressional Correspondent Rachel Scott asked Herschel Walker on Election Day about his rival questioning his character and competence -- and if he was confident that he could flip Sen. Raphael Warnock's seat.

"I'm not going to answer that," Walker said, repeating a version anytime he was presented with his opponent's name. "We're going out to win this election. So this election, I'm telling people to get out to vote."

"Hershel Walker is going to be your senator, and we're going to get things changed," Walker added.

When pressed further, Walker said, "The reason I'm not going to address that is because it doesn't need to be addressed ... Right now, I'll put my character against Raphael Warnock any day. Right now, I've done a lot of things."

Walker's strategy in the final stretch has been to link Warnock to President Joe Biden, labeling him a "rubber stamp" for Biden's agenda, a characterization Warnock has rejected.

"I am the 18th most bipartisan senator in the Senate. Period," Warnock told Scott on Monday. "Now I know that’s an inconvenient fact for Mr. Walker. We also know that he’s allergic to facts, even the facts about his own life."

-ABC News' Libby Cathey