(CNN) - Gavin Newsom has made it official. The San Francisco mayor on Tuesday formally declared his intent to enter California's gubernatorial race.
The California Democrat used the new media social-networking sites Twitter, YouTube, and Facebook to announce his bid to succeed the current governor, Republican Arnold Schwarzenegger.
"We can't afford to keep returning to the same old tired ideas and expect a different result," Newsom said in a three-minute YouTube announcement on his Web site, GavinNewsom.com. "I'm a candidate for governor of California because I know we can do better."
But Newsom could face a tough challenge in the Golden State's Democratic primary, with competition from Lt. Gov. John Garamendi and state Attorney General Jerry Brown.
"Gavin Newsom has a formidable obstacle in former California governor and current Attorney General Jerry Brown, who much better known statewide and has deep roots in the Democratic party, especially with Hispanic voters," said CNN senior political analyst Bill Schneider.
"Newsom has said that he's the Barack Obama in the race and that Brown is the Hillary Clinton, meaning that Newsom is young and fresh and that Brown is out of date. Brown tells me he thinks that argument is silly and irrelevant," Schneider said. "There is one issue that Newsom is linked, and that is gay marriage. He allowed same-sex marriages in San Francisco until the courts intervened. This could be a plus for him in the Democratic primary but a problem in the general election."
Updated after the jump
UPDATE: Republican California gubernatorial candidate Meg Whitman announced Tuesday that her gubernatorial exploratory committee is “on track” to raise at least $5 million by June 30. The former president and CEO of Ebay announced her candidacy for governor in February.
“I’m honored that people are investing in the cause to create A New California,” Whitman said in a statement released Tuesday.