"She's home!" Winfrey says in the video, standing at a door. "You are disrespecting and disregarding their legacy, their suffering and their dreams, when you don't vote".
Kemp is trying to extend the Republican domination in Georgia, which hasn't elected a Democrat as governor since 1998. Barack Obama will appear at a rally with Abrams in Atlanta on Friday, while Donald Trump is coming back to the state to stump for Kemp on Sunday.
Touting the Democratic nominee's pitch for Medicaid expansion, "common-sense gun control", environmental regulations and "keeping families together, Winfrey said Abrams offers "the values that matter to Georgians all over this state". "If there was a runoff, we would be favored to win". I am here today because I know you know that.
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. I don't want to run! "Don't want to go in those waters".
She added that she is in Georgia because of all the men and women throughout history who were "suppressed, repressed and oppressed for the right and the equality at the polls".
She was in the state on Thursday campaigning for Abrams, cheering "everybody gets a vote!"
"I'm an African-American woman who is charting a very different path to doing this", Abrams told CNN last month.
"I've earned the right to do what I want to do when I want to do it. But I also think they're excited by the possibility it could work".
"Down here in Georgia y'all going door to door".