ATLANTA (AP) - In a frantic search by phone and on foot, volunteers have been trying to find ballots that could help Democrat Stacey Abrams close the gap against Republican Brian Kemp in Georgia's unresolved race for governor.

Kemp leads in unofficial returns, and he already has resigned as secretary of state to start a transition with the blessing of the outgoing GOP governor, Nathan Deal. President Donald Trump tweeted Friday that Kemp "ran a great race in Georgia - he won. It is time to move on!"

Yet Abrams, who hopes to become the nation's first black female governor, sent out volunteers and campaign staff in search of votes that she hopes could still tilt the margin toward her. The goal was to reach voters who used a provisional ballot to make sure they take steps to ensure their vote was counted by Friday evening, the deadline.

It wasn't clear whether the effort paid off, but a majority-black county with more than 750,000 residents in metro Atlanta, DeKalb, said it would remain open past normal hours for provisional voters who needed to provide identification so their votes could be counted.

The story was different elsewhere. Two groups supporting Abrams' call to count all votes, ProGeorgia and Care in Action, said at least 12 other counties had certified election results before Friday, a move that could leave provisional ballots uncounted. The secretary of state's office did not immediately respond to an email seeking comment.

The New Georgia Project, which Abrams founded, had volunteers fanned out across the state looking for provisional ballot voters ahead of Friday's deadline. Besides knocking on hundreds of doors, the group was coordinating with black radio stations, flooding social media and texting hundreds of thousands of voters who might be wondering about provisional ballots.

Helen Brosnan, of the National Domestic Workers Alliance, trains volunteers who are working the phones in a warehouse, Friday, Nov. 9, 2018, in Atlanta, where they are frantically trying to reach Georgians who voted with provisional ballots to make sure their votes are counted. (AP Photo/Jeff Martin)

Nse Ufot, executive director of the group, said the effort "is not about the candidates."

"This is about whether we're going to have a functioning democracy," said Ufot. "Otherwise, people won't be reasonably assured that the will of Georgians is reflected in the results of the elections."

Abrams' lawyers are exploring options to ensure all votes are counted. Her campaign leaders say they believe she needs to pick up about 25,000 votes to force a runoff.

In a warehouse-turned-phone bank near downtown, dozens of volunteers converged to make phone calls to voters who used a provisional ballot.

Helen Brosnan of the National Domestic Workers Alliance stood on a chair and shouted, "How many calls do you think we can make? Can we make hundreds of calls? Let's do this!"

Marisa Franco, 27, saw a friend's Facebook post about the effort, then showed up at the warehouse to volunteer Friday morning.

"I think that it's really central to democracy that everybody who is eligible to vote can vote and has the least amount of barriers possible, so I'm just here to make sure that every vote counts," she said.

Returns show Kemp with 50.3 percent of almost 4 million votes, a roughly 63,000-vote lead over Abrams. The difference is enough for an outright victory if total totals remain the same, but it's a narrow sum, considering the large turnout.

The Associated Press has not declared a winner in the race for Georgia governor. The AP will reassess the race Tuesday, the deadline for counties to certify election results to the state.

With legal wrangles opening and Abrams showing no signs of conceding, the dispute is prolonging a bitter contest with historical significance and national political repercussions.

Abrams' campaign manager, Lauren Groh-Wargo, said Kemp was to blame for problems because he was the secretary of state, Georgia's top election official, and tried to tamp down minority votes.

"These suppressive tactics are reminiscent of the Old South, tactics that have been resurrected by Brian Kemp, who forced the state to allow him to oversee his own election, and had him be the decider on who was the winner," she said at a news conference.

Kemp contends he did his job properly and has argued that Abrams wants to help noncitizens vote illegally. Kemp, who has echoed Trump's immigration rhetoric, cited a speech in which Abrams said "undocumented" people were part of her coalition.

Abrams would become the first black woman elected governor of any U.S. state. Kemp seeks to maintain Republican dominance in a growing, diversifying Deep South state positioned to become a presidential battleground.

The key question is how many uncounted ballots actually remain.

Kemp said Thursday that it's fewer than 21,000 - almost certainly not enough to force a runoff. Abrams' campaign argues the total could be higher, and the secretary of state's office has shared scant details as officials in Georgia's 159 counties keep counting.

Abrams' campaign has reserved television advertising time and started sending vote-by-mail information to supporters in case she forces a Dec. 4 runoff with Kemp.

___

AP writer Errin Haines Whack contributed to this report.

___

Follow Barrow on Twitter at https://twitter.com/BillBarrowAP.

___

For AP's complete coverage of the U.S. midterm elections: http://apne.ws/APPolitics

This combination of May 20, 2018, photos shows Georgia gubernatorial candidates Stacey Abrams, left, and Brian Kemp in Atlanta. Democrats and Republicans nationwide will have to wait a bit longer to see if Georgia elects the first black woman governor in American history or doubles down on the Deep South's GOP tendencies with an acolyte of President Donald Trump (AP Photos/John Amis, File)

Helen Brosnan, left, an organizer with the National Domestic Workers Alliance, speaks with an unidentified volunteer in Atlanta, Ga., on Friday, Nov. 9, 2018. They are working to inform Georgia voters who used a provisional ballot to turn them into their election office. (AP Photo/ Ron Harris)

Allegra Lawrence-Hardy, Stacey Abrams' campaign chairman, stands with attorneys during a news conference Thursday, Nov. 8, 2018, in Atlanta. Republican Brian Kemp resigned Thursday as Georgia's secretary of state, a day after his campaign said he's captured enough votes to become governor despite his rival's refusal to concede. Abrams' campaign immediately responded by refusing to accept Kemp's declaration of victory in the race and demanding that state officials "count every single vote." (Bob Andres/Atlanta Journal-Constitution via AP)

Republican Brian Kemp, right, and Georgia Gov. Nathan Deal hold a news conference in the Governor's ceremonial office at the Capitol on Thursday, Nov. 8, 2018, in Atlanta, Ga. Kemp resigned Thursday as Georgia's secretary of state, a day after his campaign said he's captured enough votes to become governor despite his rival's refusal to concede. (Bob Andres/Atlanta Journal-Constitution via AP)

Helen Brosnan, an organizer with the National Domestic Workers Alliance, gives instructions to volunteers in Atlanta, Ga., on Friday, Nov. 9, 2018. The group is working to inform Georgia voters who used a provisional ballot to turn them into their election office. (AP Photo/ Ron Harris)

Helen Brosnan, of the National Domestic Workers Alliance, trains volunteers who are working the phones in a warehouse, Friday, Nov. 9, 2018, in Atlanta, where they are frantically trying to reach Georgians who voted with provisional ballots to make sure their votes are counted. (AP Photo/Jeff Martin)