I wondered as well why it has to go before Congress and one of the answers I read is that since it was a Senator that conducted the investigation, and several players already testified before Congress that the precedent is set.
Yeah, that's what it is. It isn't that this particular accusation warrants a hearing, its just that its all part of the same inquiry. And all of this happened because it became very clear that baseball had no intention of doing anything about it.
Its pathetic that we have to have Congress on this when there should be far bigger concerns in Washington. That's on Selig IMO. Worst commissioner in the history of sports.