Democrat Joan Buchanan appeared to have won Assembly District 15 by about 10,000 votes early Wednesday, but there was no official concession yet from the campaign of Republican Abram Wilson.
With 100 percent of the precincts counted, Buchanan had 99,833, or 52.9 percent of the vote, to 89,013, or 47.1 percent, for Wilson.
Matthew Del Carlo, Wilson's campaign manager, expressed hope earlier that the numbers could still move his candidate's way because Contra Costa County, where Wilson is mayor of San Ramon, had yet to be counted.