San Francisco mayoral candidate Mark Leno has a slim lead over Supervisor London Breed, but tens of thousands of ranked choice votes must still be counted.
In the first round of tallying votes, Breed received 36 percent of the first place votes to Leno's 26 percent.
But as second place votes were added to Leno's overall tally, his totals surpassed Breed's total votes.
Confused? Check out our ranked choice voting animation.
In addition to redistributing second place votes, elections officials must also account for mail-in and provisional ballots, which may change the results yet again.