Georgia Lt. Gov. Geoff Duncan, a Republican, told ABC News Live he's worried that President Donald Trump's baseless allegations of election fraud in the state "absolutely" might have depressed GOP turnout in the runoff races.

"Unfortunately, too many folks in our party over the last two months have been talking about misinformation, election fraud and creating a distraction," Duncan said.

"We've been outworked, out-focused, but my hope is that Kelly Loeffler's and David Purdue's hard work over the last two months is going to get them across the finish line and help us kind of regroup as a party here in this state, and also as a country, and be able to roll back out and get the White House in 2024," he added.

ABC News Chief Congressional Correspondent Mary Bruce stressed the significance of Tuesday's runoffs, not only because they will determine control of the Senate but because they leave President-elect Joe Biden's agenda hanging in the balance.

"It's not just how much he can get done but also the expediency with which he might be able to get things done," Bruce said, outlining big promises in Biden's agenda, from health care to climate change.

Biden has noted in recent days, while stumping for Democratic candidates, that if Democrats are able to win both seats, the $2,000 stimulus checks Democrats have been pushing for could happen immediately. Also, the approval of additional aid to state and local governments and resources to distribute the coronavirus vaccine in a more timely fashion could come quickly.

"Not to say that Joe Biden's agenda would hit a complete brick wall if Republicans continue to maintain control in the Senate because, of course, Joe Biden prides himself on having a great working and personal relationship with Republican leader Mitch McConnell, but it certainly would make Joe Biden's agenda and his political ambitions here much, much, much easier," Bruce said.

Bruce also noted how the expected efforts by Republicans to object to the certification of the Electoral College results on Wednesday could give the public a sense of the "uphill battle" Biden may face if the GOP does maintain control of the Senate.

The turnout of Black voters in Georgia’s runoff Senate races rose a percentage point from what it was in November, according to ABC News’ preliminary exit poll -- potentially a positive signal for Democratic candidates Jon Ossoff and Raphael Warnock.

The African American turnout is "a very encouraging sign for Democrats. It shows that they’re getting their base out,” ABC News Political Director Rick Klein said on ABC News Live.

Preliminary exit poll reporting shows that Black voters account for 29% of the electorate in Tuesday's race, up from 28% in November.

The exit poll data indicates that 93% of Black voters turned out for both Ossoff and Warnock.

"[African Americans are] as reliable of a Democratic bloc as there is and so far the Democrats look like they did their job in getting them to the polls," Klein said.

More than 3 million voters in the Georgia runoff elections cast their ballots early -- 1,018,381 by mail and 2,074,994 early in-person -- according to Georgia Votes, already a record-setting figure for runoff elections.

The total early vote so far also includes 123,079 who did not participate in November's general election -- which is 35,000 more votes than the margin that separated Sen. David Perdue and Jon Ossoff the first time around, when the incumbent Republican edged out his challenger by just over 88,000 votes. Sen. Kelly Loeffler and Raphael Warnock were competing in a jungle primary in which the large field diluted their vote shares.

The secretary of state's office won't have Tuesday's in-person turnout numbers until at least 1 p.m. on Wednesday when counties are required to report how many ballots they received Tuesday in order to calculate the number of outstanding ballots. It may take days for the final results to become available depending on how close the races are.

Republicans are relying on high Election Day turnout, believing close to a million votes on Tuesday is likely their path to victory. At a rally in Dalton on Monday night, President Donald Trump signaled how many votes Republicans are eyeing: "I guess we have to get over a million votes tomorrow, right, Kelly? Over a million. All right. That's a lot of votes, Kelly, but we'll do it."

-ABC News' Quinn Scanlan, Kendall Karson and Meg Cunningham

Warnock called his projected victory a "historic moment," saying he "can't wait" to be in the upper chamber of Congress "to represent the concerns of ordinary people."

"I'm deeply honored that the people of Georgia decided to place their faith in me and have decided to send me to represent their interests in Washington, D.C.," Warnock told ABC News Chief Anchor George Stephanopoulos in an interview Wednesday on "Good Morning America."

"Certainly, this is a historic moment and I'm just deeply grateful to be a vessel in a moment in which we're facing such large problems in our country," he added, "and I can't wait to get to the U.S. Senate to represent the concerns of ordinary people."

Warnock, a senior pastor of the Ebenezer Baptist Church in Atlanta, the former pulpit of the Rev. Martin Luther King Jr., is the first Black senator Georgia has elected and only the 11th Black senator elected in U.S. history.

"Georgia is in such an incredible place when you think about the arc of our history, we are sending an African-American pastor of Ebenezer Baptist church where Martin Luther King Jr. served," he said. "This is the reversal of the old southern strategy that sought to divide people. In this moment we've got to bring people together in order to do the hard work and I look forward to doing that."

When asked about his top priority for this year in the Senate, Warnock said -- as he has throughout his campaign -- that the country needs to get the coronavirus pandemic under control.

"Like so many Americans, as we witnessed the incredible death toll over 350,000 Americans lost lives, lost livelihoods, we need a national strategy that takes this virus seriously, that gets the vaccine distributed safely and efficiently," he said. "We've got to re-open our economy, get our kids safely back to school and we got to make sure that people know that they will have their health care, particularly in the middle of a pandemic."

-ABC News' Quinn Scanlan