the original vote in late march was 5-4 to dump the piece of garbage. The next day obama has a fit about it after getting the leaked info. commie media and obama attack the court and roberts, knowing he is the target that must be reached. Obama threatens the court again and then a mid-May vote is taken with roberts switching his vote. From that point the 4 conservatives tried desperately to have roberts switch, with ginsberg later saying “it was contentious”.
I'd be willing to wager more than a couple of boxes of popsicles that Kagan was the leaker.