Oakland City Councilwoman Jean Quan announced today that she has officially launched an exploratory committee for the 2010 mayor's race. The committee allows Quan, who represents Montclair and the Laurel districts, to raise money and gauge support for her candidacy. Quan told the Trib that she will officially announce her candidacy for mayor if she can attract a volunteer base of at least 500 people and raise sufficient campaign funds. Quan would then join ex-state Senator Don Perata as the only two official candidates in the race. Mayor Ron Dellums has not yet announced whether he plans to run for reelection.