Gavin Newsom, mayor of San Francisco who made national headlines in 2004 when he challenged California state law by allowing gay and lesbian couples to marry, has quit the governor’s race in California.

Newsom is withdrawing from the Democratic primary amid lackluster poll numbers and meager fund-raising receipts. His withdrawal leaves state Atty. Gen. Jerry Brown, who is expected to run even though he has not officially entered the race, with little opposition in the Democratic primary.

“It is with great regret I announce today that I am withdrawing from the race for governor of California,” Newsom said in a statement. “With a young family and responsibilities at City Hall, I have found it impossible to commit the time required to complete this effort the way it needs to — and should be — done. This is not an easy decision. But it is one made with the best intentions for my wife, my daughter, the residents of the city and county of San Francisco, and California Democrats.”

Although Newsom had been effectively running for more than a year, his campaign never gained much traction. Even in his hometown, which Newsom touted as a model of cutting-edge policies, his candidacy was widely derided among civic insiders.

The events of 2004 which gave Newsom national prominence set off a chain reaction that ultimately led to overturning the gay marriage ban by the California Supreme Court and the ultimate passage of Prop 8.