Mark Leno leading SF mayor's race by just 255 votes

SAN FRANCISCO (KGO) -- The San Francisco mayor's race just got a whole lot closer. The latest update has Mark Leno in front by just 255 votes over Supervisor London Breed.

RELATED: Bay Area election results

On Wednesday, Leno was 1,100 votes ahead.

Another update will be released on Friday.

VIDEO: Here's how ranked-choice voting works

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San Francisco has been using ranked-choice voting since 2004. Here's how it works.

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