Abrams' campaign said she would appear with Winfrey in Cobb and DeKalb counties for a discussion on "the critical value of women in leadership and what is at stake for our communities in the election".
The contentious gubernatorial race between Abrams, a former leader in the state House of Representatives, and her Republican opponent, Georgia Secretary of State Brian Kemp, has been marred by accusations of voter suppression.
Polls suggest Abrams and Kemp are deadlocked in one of the hottest matchups of the midterm elections. But Kemp's campaign said the president's schedule takes precedence, and he's coming to Macon, about 100 miles south of Atlanta, to hold a campaign rally with Kemp at 4 p.m.
Oprah Winfrey is bringing her star power to one of the nation's hottest governor's races, even as President Donald Trump and former President Barack Obama try to put their imprint on the Georgia election. There's a possibility of a December runoff, given that Libertarian Ted Metz also is on the ballot and Georgia's requirement that the victor garner a majority of the votes. Earlier this month, a coalition of state civil rights groups sued Kemp, accusing him of trying to depress minority voter turnout to improve his chances of winning.
She added a note to the throng of media gathered for the event, urging against any reboot of recent speculation that she might run for president in 2020. She is expected to speak about why she supports Abrams' campaign.More news: Rep. John Lewis gets "Happy" at an event for Stacey Abrams
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'I'm not here because I'm making some grandstand for myself.
"I don't want to run, OK?" "I'm not testing the waters", she said.
Democrat Stacey Abrams would not say Tuesday whether she would support rounding up AR-15 firearms from Georgians if elected governor. The candidate has a chance to become the first black woman to be governor of a state.
Abrams is looking to maximize turnout among nonwhites, liberal urban whites and just enough whites everywhere else, including a smattering of moderates and suburban Republicans who are disenchanted with Trump - a considerable overlap with the fan base that propelled Winfrey to her billionaire icon status.