Kemp is a staunch conservative who has embraced U.S. President Donald Trump and the administration's hard-line on immigration.
The race has drawn national attention, with Abrams receiving endorsements from Oprah Winfrey and former President Barack Obama. 'I'm not here to test any waters.
She said: "Oprah Winfrey has inspired so many of us through the years with her unparalleled ability to form real connections and strengthen the bonds of family and community".
"Well, I think they would want them to vote, but not certainly not vote based on one's identity", Aubrey Shines said in a video message. "Don't want to go in those waters".
In an apparent reference to the controversy, Winfrey said, "Every single one of us - every single one of us - has the same power at the polls, and every single one of us has something that, if done in numbers too big to tamper with" - she paused for resounding, prolonged applause by the audience - "cannot be suppressed and can not be denied".
More than 1.5 million of the state's nearly seven million registered voters have cast ballots already. They don't help. Just ask Hillary Clinton.
After her speech she noted both women were "just two women from MS". She recalled generations of black Americans who faced "lynching ... oppression ... suppression", and declared that "their blood has seeped into my DNA" and forced her to the polls. Abrams is a Democrat running for governor in Georgia.
Actor Michael B. Jordan has knocked on doors in Atlanta urging black voters to turn out, and Actor and comedian Will Ferrell has also canvassed for Abrams' campaign. He then blasted Abrams' policy pitches on health care and education.
After Winfrey's speech, Abrams climbed the stage to join a discussion and was greeted by chants from the audience.
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