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255 votes separate contenders in San Francisco mayor’s race

June 8, 2018 GMT
Board of Supervisors President London Breed, right, greets supporters after speaking to reporters in San Francisco, Wednesday, June 6, 2018. Former state Sen. Mark Leno pulled ahead in San Francisco's race for mayor by the slimmest of margins early Wednesday under the city's unusual voting system, although Breed maintained her lead in first-place votes. (AP Photo/Jeff Chiu)
Board of Supervisors President London Breed, right, greets supporters after speaking to reporters in San Francisco, Wednesday, June 6, 2018. Former state Sen. Mark Leno pulled ahead in San Francisco's race for mayor by the slimmest of margins early Wednesday under the city's unusual voting system, although Breed maintained her lead in first-place votes. (AP Photo/Jeff Chiu)
Board of Supervisors President London Breed, right, greets supporters after speaking to reporters in San Francisco, Wednesday, June 6, 2018. Former state Sen. Mark Leno pulled ahead in San Francisco's race for mayor by the slimmest of margins early Wednesday under the city's unusual voting system, although Breed maintained her lead in first-place votes. (AP Photo/Jeff Chiu)
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Board of Supervisors President London Breed, right, greets supporters after speaking to reporters in San Francisco, Wednesday, June 6, 2018. Former state Sen. Mark Leno pulled ahead in San Francisco's race for mayor by the slimmest of margins early Wednesday under the city's unusual voting system, although Breed maintained her lead in first-place votes. (AP Photo/Jeff Chiu)
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Board of Supervisors President London Breed, right, greets supporters after speaking to reporters in San Francisco, Wednesday, June 6, 2018. Former state Sen. Mark Leno pulled ahead in San Francisco's race for mayor by the slimmest of margins early Wednesday under the city's unusual voting system, although Breed maintained her lead in first-place votes. (AP Photo/Jeff Chiu)

SAN FRANCISCO (AP) — The gap between the two leading candidates for San Francisco mayor shrank to 255 votes on Thursday.

An elections office update shows former state Sen. Mark Leno still leading President of the Board of Supervisors London Breed in a race that remained too close to call.

But he had been ahead by 1,121 votes on Wednesday.

Breed has the most first-place votes of eight candidates, but Leno is ahead because San Francisco uses a ranked-choice system that allows voters to pick their top-three choices in order.

Supervisor Jane Kim and Leno asked supporters to vote for the other as their No. 2 choice on the ballot. She is in third place.

Leno said he expects the vote-leader to fluctuate.

Elections officials said there are 84,000 ballots left to count.