African-American and female voters will be critical in the race for governor between Democrat Stacey Abrams and Republican Brian Kemp.
"Whites are voting at about the same level as 2014, whereas African-Americans have surged quite a bit, as have other persons of color," McDonald wrote on Twitter.
No votes will be counted until Election Day on Nov. 6, and the first wave of absentee-by-mail ballots account for about 1 percent of all early votes cast in the 2014 midterms.
Georgia allows anyone to vote by mail on absentee ballots.
In-person early voting begins across the state on Oct. 15. The deadline to register to vote for this year's election is Oct. 9.
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