What happens if SCOTUS upholds the individual mandate:
[T]he right wing will explode. And perhaps even more so due to the fact that expectations of Obamacare being declared unconstitutional have been raised. That should give the Republicans a big boost in the current enthusiasm gap. Because you can count on them making repeal of Obamacare a signature issue. That might help Republicans running for Congress is some key districts, but I'm not so sure its would be a good thing for Mitt Romney. I suspect that with his history in Massachusetts, he'd prefer that Obamacare be taken off the table in this election.
Previous thoughts on the politics of a mandate defeat here, here and here.
The Dish 