/facepalm
So it's your position that this:
happened yesterday? Really? That explains a lot.
I know you're not too swift, so let me step through this slowly. Nobody claimed the Obama administration wasn't aware of the allegations. The point is that when Miller testified about this issue before Congress (July, 2012, IIRC), he denied any knowledge of those allegations having a basis in fact. That was recently determined to be a lie, and he was fired. So yes, the WH knew of the claims, but they also had sworn testimony denying those claims. It was only a few days ago they learned there was more to the story, so far as we know.