Gabriel Sterling, the chief operating officer for the Georgia secretary of state's office, predicted on social media that Election Day turnout will “exceed 1 million.”

That would be on top of the nearly 1.9 million people who’ve already voted early or cast an absentee ballot. Georgia shattered records for early voting turnout in the runoff between Warnock and Walker.

As of Tuesday morning, Sterling wrote on Twitter that 250,000 people had already gone to the polls to vote that day. Polls close at 7 p.m. ET.

At an Election Day canvass launch in the metro Atlanta suburb Norcross, Sen. Warnock told supporters not to get deterred by the light rain and to show up big at the polls.

"We're not leaving anything to chance which is why we're standing out here getting sprinkled and baptized. We're leaving it all on the field. But I got a feeling that the people of Georgia are gonna get this right and we're gonna get this done one more time," Warnock said to cheers.

Still, he told supporters not to "rest on our laurels," arguing there was still a pathway to victory for Walker.

"More of our voters tend to vote during the early period. And more of [Walker's] voters tend to vote on Election Day. So if you haven't voted, by all means vote," Warnock said. "And if you've already voted, your job still isn't done until everybody in your circle [votes]."

Warnock said he wasn't thinking about the Senate majority heading into election night.

"I know folks are doing all the other calculations and that's fine. But this really is about who's going to represent Georgia," he said.

Asked about his reaction to Walker's comments that he will "put my character up against Raphael Warnock any day," Warnock told ABC News, "My opponent says many things. You can't believe any of it."

In the final days of his Senate campaign, Walker declined to respond when asked on the trail about claims from an alleged former ex-girlfriend that he had a history of pathological lying, manipulation and violence.

On Thursday, during his first event following a report from The Daily Beast that included an interview with the woman, Cheryl Parsa, Walker delivered a standard stump speech without taking any questions from reporters.

After the rally, campaign staffers told ABC News they were not engaging with the Daily Beast story, contending that it was not gaining traction and that they were focused on winning the election.

On Sunday, NBC News aired an interview with Parsa, who has claimed Walker physically assaulted her during a five-year relationship. Parsa reiterated to NBC News an account she gave the Daily Beast about when Walker allegedly became violent, attacking her in 2005.

At a campaign event after the broadcast, the campaign again declined to comment.

Walker has previously denied accounts from other women that he paid for their abortions. He is running as a staunchly anti-abortion candidate.

"Democrats will say and do anything to hang on to power. Well, I'm Herschel Walker, and they picked the wrong Georgian to mess with. I'm not backing down the stakes are too high," Walker said in a statement in October.

Years before he ran for the Senate, while promoting a memoir about having dissociative identity disorder, he did not deny an account from ex-wife Cindy Grossman that he became violent during their marriage.

A top election official in Georgia’s secretary of state's office, Gabriel Sterling, said Tuesday on social media that Election Day voting was "running smoothly" and that, as of around noon local time, the average wait to vote statewide was down to one minute.

Sterling, the deputy interim secretary of state, wrote on Twitter that his office estimated more than 250,000 Georgians had cast their ballots that morning, calling the turnout "steady."

On Friday alone, the last day of early voting for the Senate runoff, 352,953 people cast ballots, according to state elections data -- bringing the total number of early votes, either in person or absentee, to more than 1.8 million -- shattering early in-person voting records for the state.

Republicans are hoping for a high Election Day turnout as data indicates that more Democrats got out the vote early.

-ABC News' Libby Cathey

Walker’s son was quick to respond to his father’s projected loss in the election, implying that the number of controversies that arose throughout his campaign -- many of which Walker has denied or dismissed as political smears -- contributed to his defeat.

Christian Walker, a conservative social media personality, recently became openly critical of his dad. He denounced Herschel Walker in a series of social media posts and videos in early October after the candidate denied a Daily Beast report that he paid for an ex-girlfriend's abortion in 2009. Herschel Walker has campaigned for the Senate as an anti-abortion politician.

In a string of tweets Tuesday night, the younger Walker touched on many of scandals swirling around the candidate, including those related to abortion, allegations of past domestic violence and absentee parenting.

“Chase more fame, lie, lie, lie, say stupid crap, and make a fool of your family,” he wrote in one tweet.

“The Truth: Trump called my dad for months DEMANDING that he run. Everyone with a brain begged him: “PLEASE DON’T DO THIS. This is too dirty, you have an insane past… PLEASE DONT DO THIS,” Christian Walker continued..

Later, during an audio-only event on Twitter when he took questions about his thoughts of his father and the election, Christian Walker told ABC News it had been a while since they spoke but he didn't rule out a reconciliation at some point.

"It's hard because I'm angry right now. But you know, I need some time to breathe, I know, I'll say that," he said. "And honestly, the thing that I want most out of him is, at the end of the day, gosh, time flies, like I'm an adult. So I'm grown. I'm making money ... Go be the best dad."

Herschel Walker tweeted in October, in response to some of Christian Walker's criticisms. "I LOVE my son no matter what."

-ABC News' Hannah Demissie contributed to this report.