Gwinnett, a rapidly diversifying patchwork of suburbs near Atlanta, has long been a Republican stronghold, but Hillary Clinton carried the county in 2016. Just more than half of the county’s residents are white, and about a fifth are Hispanic or Latino.
Joe Sorenson, a spokesman for the county government, said the four problematic precincts reported issues with the system that creates voter access cards for Georgia’s electronic polling system. At the three where problems lingered at midmorning, people were being allowed to cast paper ballots. At the county’s request, a judge extended polling at one location.
“We’ve got people who are voting with the paper ballots, and we’ve got people who are standing to wait for the machines to be fixed, and we’ve got people who said they are planning to come back,” Mr. Sorenson said.
Bradford Berry, the general counsel of the National Association for the Advancement of Colored People, said, “Obviously, when you have aging voting equipment, you’ll have some machines break down.”
But, he added that “we need to make sure that the machines that are breaking down in Georgia are not in certain parts of town, and not in others.”
Although county elections officials appeared at fault for some of the issues in Georgia, a spokeswoman for Ms. Abrams’s campaign, Abigail Collazo, blamed Mr. Kemp for the day’s troubles.
“We’re incredibly inspired by how many Georgians are turning out to vote and are staying in line to cast their ballot, despite the fact that some polling locations were not properly prepared by the secretary of state’s office,” she said in a text message.