Along with Wu being a high-level flake and Pelosi & Co.

wanting to just cover it up, I can't help thinking about this:
Last fall, Wu's senior campaign staff quit en masse after confronting him about his ongoing drinking problem, watching him throw hissy fits at the Portland International Airport and at a local Democratic Party event, and receiving the now-infamous e-mail photo of him smiling in a Tigger costume.

Wu's staff received another photo of him seemingly passed out on a bed in the same costume in the wee hours of the morning, along with incoherent e-mails from his official government BlackBerry signed in the names of his tween-age children. The staffers so feared what Wu might do next that they kept him hidden from public view in the final days of the campaign.
So he's been doing this crap for years, he was bad enough that his staff quit- after the last election- and actually hid him during the campaign BUT THEY STILL WORKED HARD TO GET HIM REELECTED.

Assholes.