On Tuesday, Congressman David Wu, D., OR, announced his resignation, effective once the debt-ceiling vote is taken, after allegations surfaced he had an "unwanted sexual encounter" with a teenage girl last Thanksgiving.
Originally, Wu insisted he wouldn't resign and instead stated he wouldn't seek reelection in 2012. However, House Minority Leader Nancy Pelosi, D., CA, requested an Ethics Committee investigation into Wu's behavior.
If Wu hadn't resigned, the Ethics Committee couldn't have charged him with a crime but they could have referred his case to the Department of Justice, as they did with the John Ensign case.
Wu has a history of erratic behavior, such as sending an infamous picture of himself in a tiger costume to campaign staffers during last November's elections.