(CNN) Democratic candidate Stacey Abrams is not conceding the Georgia governor's race to Republican candidate Brian Kemp, arguing that the high stakes contest is too close to call with the possibility of a runoff next month.

Kemp is currently ahead of Abrams by nearly 68,000 votes with 99% of precincts reporting, according to CNN election results. But he only has 50.4% of the vote. If neither candidate receives 50%, there will be a runoff in early December.

"I'm here tonight to tell you votes remain to be counted. There's voices that are waiting to be heard," Abrams, who would be the nation's first black female governor, told supporters early Wednesday morning gathered in Atlanta.

Kemp told supporters he is confident of his victory.

"There are votes left to count. But we have a very strong lead. And folks, make no mistake, the math is on our side to win this election," he said.

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