State Sen. Leland Yee

An FBI agent carries out boxes of evidence following a search of a Chinatown fraternal organization Wednesday. State Sen. Leland Yee (D-San Francisco) was arrested during a series of raids by the FBI in Sacramento and the San Francisco Bay Area, authorities said. An FBI spokesman confirmed Yee’s arrest but declined to discuss the charges, citing an ongoing investigation.  (Eric Risberg / Associated Press)

A woman stands in an alleyway and watches federal agents and police search a Chinatown fraternal organization Wednesday in San Francisco, part of a series of raids in public corruption probe confirmed by the FBI.   (Eric Risberg / Associated Press)

Federal agents load boxes of evidence into a car following a search of a Chinatown fraternal organization Wednesday in San Francisco. An FBI spokesman confirmed the arrest of state Sen. Leland Yee in the series of raids but declined to discuss the charges, citing an ongoing investigation.  (Eric Risberg / Associated Press)

California state senator and candidate for San Francisco mayor Leland Yee greets a friend in front of his campaign headquarters on Nov. 7, 2011. in San Francisco.  (Justin Sullivan / Getty Images)

Leland Yee, a state senator, campaigns for San Francisco mayor on a MUNI bus in 2011 in San Francisco.  (Justin Sullivan / Getty Images)

State Sen. Leland Yee campaigns for the San Francisco mayoral job along Hayes Street in November 2011.  (Justin Sullivan / Getty Images)

California State Sen. Leland Yee and his wife, Maxine, left, talk with a supporter of his bid to become mayor of San Francisco as they wait in line to cast their ballots at a polling station at City Hall in November 2011.  (Justin Sullivan / Getty Images)