The race for the state's attorney general seat has traded hands several times, and with Harris most recently trailing, the San Francisco politician took the lead in the statewide race by 3,609 votes.
But with votes still to count, the lead is expected to change hands several times more before a final victor is crowned.
The race is so tight that the secretary of state's website has not been able to keep up with the latest lead changes.
The Los Angeles Times reports its count of 58 California counties gave Harris a slight lead of 4,131,847 votes to her Republican rival Los Angeles County Dist. Atty. Steve Cooley's 4,128,238 votes as of Friday.
Regardless of who ultimately sits on top when all the votes are counted, there could be a challenge to the finally tally as some within Cooley's camp have started to question how the votes were tallied.