Videos uploaded to Ms Winfrey's and Ms Abrams' social media showed the television personality knocking on doors canvassing for the hopeful governor.
The entertainment icon, who rarely makes political endorsements, drew cheers when she said she's a registered independent who was not in Georgia at anyone's request.
Kemp said the election was about "this generation and generations to come and the kind of state that we leave them". "Well I'd like to remind Stacey Abrams and Oprah and Will Ferrell-I'm kind of a big deal too". Claiming that Abrams is "bankrolled by Hollywood liberals", he blasted Oprah Winfrey's appearance with the Democrat at a pair of town halls in metro Atlanta, as well as actor Will Ferrell's recent campaign appearance in Georgia.
"I was sitting at home in California, minding my own business, but I could not stop hearing about what's going on down here", Winfrey said, charming the crowd that had gathered to see her.
And someone out front was wearing a giant chicken suit holding a sign that reads "too chicken to debate", alluding to Kemp withdrawing from a debate scheduled Sunday in favor of appearing in Macon with President Donald Trump.
"So we're basically saying Stacey Abrams has got it in the bag and she has no problems", McCain said. "[She] has been down to Mar-A-Lago.until I ran for office we did very well".
Taking into account the historical voting patterns and the representation of African Americans in USA politics, Abrams' campaign has drawn much public attention.
"I'm 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 ... I'm not testing the waters", Winfrey said.
Republicans in Georgia, including Kemp, have pushed for strict voter ID laws, citizenship checks and aggressive voter roll maintenance in the name of protecting elections against fraud and noncitizens voting. All of those demographics overlap with Winfrey's fan base, and she will hit them all with events in Republican-leaning Cobb County and heavily Democratic DeKalb County, both within miles of downtown Atlanta.
The billionaire added, "I wanted to do whatever I could to lend my support".