a. The SCOTUS overturns the law. OBama and Leahy look ignorant. Obama's re-election campaign takes a major hit, as his signature achievement is found to be un-Constitutional.
b. SCOTUS upholds the law. In this case, Obama and Leahy look very strong, very persuasive in their rhetoric. Obama supporters go crazy, and independents are also swayed. SCOTUS is for all intents and purposes, rendered impotent for any future ruling concerning Constitutional matters.
c. SCOTUS overturns the law. Obama and Leahy knew in advance the decision, because it was leaked to them. Their recent attacks on SCOTUS are for political reasons--they will run on the overturned decision, and blame Republicans for "taking healthcare away from people who need it the most."
C is the answer. They know. I cannot believe they would be publicly reacting like this if the decision were going their way. They are setting up the post-decision scenario.