Wu married Michelle Maxine Wu in 1996 and they have two children. In December 2009, he filed for separation from his wife, citing irreconcilable differences.
Three weeks prior to the 2004 elections, The Oregonian published an article reporting that Wu had been accused of sexually assaulting an ex-girlfriend while attending Stanford. Criminal charges were never filed, but the story prompted Wu to hold a press conference apologizing for "inexcusable behavior".
In February 2011, Willamette Week and later The Oregonian reported that in the runup to the November 2010 election, Wu began behaving erratically and that staffers "demanded he enter a hospital for psychiatric treatment." The erratic behavior that triggered the staff's departure was reported to be no single incident but rather a pattern of behavior that included Wu's emailing his staff photos of himself in a tiger suit.
...and they still reelected him.