The comedian emphasized the personal "sacrifice" Winfrey, a registered independent, made by endorsing Abrams, the first female African-American gubernatorial nominee in US history.
Also rallying behind Ms Abrams is former president Barack Obama and Hollywood names such as Will Ferrel and Mark Ruffalo, who have all campaigned in the midterm elections runup. "I am not trying to test any water, don't want to go in those waters".
Winfrey will be joining Abrams on the campaign trail. I don't wanna go in those waters, ' she said, shaking her head and waving her finger.
She added that Abrams is "standing strong for the values that matter to me and the values that matter to Georgians all over this state".
Recent polls show Abrams and her Republican opponent, Brian Kemp, Georgia's secretary of state who has been endorsed by President Trump, in a dead heat. "Come on, Oprah! It's dehumanizing, it's completely baseless, it's totally cruel, and again I say, you're much better than that and you're much bigger than that". The call, sent to an unknown number of Georgians, impersonates Oprah Winfrey, the billionaire media titan who came to Georgia on Thursday to support Abrams.
More than 1.5 million of the state's nearly seven million registered voters have cast ballots already.
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He also talked about the low unemployment rate. Elizabeth Warren of MA for criticism. Cory Booker of New Jersey and Sen.
As a black woman, Winfrey noted her kinship to two groups historically denied ballot access in the United States.
"I am here today because of the men and because of the women who were lynched, who were humiliated, who were discriminated against, who were suppressed, who were repressed and oppressed... and I refuse to let their sacrifices be in vain."
The Georgia governor's race is one of the most closely watched campaigns in the nation and is attracting top surrogates from both parties in the final days before the election. They don't help. Just ask Hillary Clinton.
After Winfrey's speech, Abrams climbed the stage to join a discussion and was greeted by chants from the audience.