But Dale Washburn, a Republican state legislator who introduced Ms. Loeffler at the event, had another warning. This one was based not on ideology, but on numbers that suggest Democrats are outpacing Republicans in early voting turnout — which means that Republicans may need a tremendous election-day performance on Jan. 5 if they are to win the state’s two high-stakes runoff races and maintain control of the Senate.

“We’re fully aware of the energy on the other side, and think we’ve been reminded about that,” Mr. Washburn said. “We know demographics have changed in recent years. And if our side hasn’t been aware of that, they’re rapidly becoming aware of that. The Biden victory had a big part.”…

The breakdown of votes so far shows that vote-rich Democratic strongholds, including Fulton and DeKalb Counties in metropolitan Atlanta, are posting high numbers, while African-Americans statewide are “voting their weight and then some,” said Charles S. Bullock III, a political scientist at the University of Georgia.

At the same time, Dr. Bullock noted, turnout has been weak in the northwestern part of the state, which is home to many working-class white Trump supporters. In Walker County, which Mr. Trump won with 79 percent of the vote, the turnout, as of Wednesday, was only 47 percent of the general election total, according to the website georgiavotes.com.