Hard to see this as anything but a giant boost for Obama and his chances this Fall.
I doubt that. Right now, health care's not as big an issue as the economy, and it won't be a big issue in the fall. This will be a bigger boost to Democratic candidates in 2016, after the law has taken full effect. At that point, GOP candidates will have to explain to voters why they opposed or still oppose what will most likely be a popular (or at least uncontroversial) program.
Disagree. This destroys Romney's biggest talking point against Obamacare - he's been running around calling it 'unconstitutional' in every single speech he gives. And he's specifically said that the difference between this and the health plan he supported was that mandates are constitutional on a state level, but not a national one.
It's now going to be extremely difficult for him to differentiate himself from Obama on this issue, which is a big failure for him.
And it's a boost for Obama. If the mandate were struck down, there would be chaos as we struggled to figure out the results. If the whole ACA were struck down, Obama would have been pilloried for 'wasting time' on an unconstitutional law. By both the left and the right.
Additionally, it's a gigantic morale killer on the right-wing, who were running around guaranteeing everyone (mostly themselves) that the SC would overturn this ruling, and save them a lot of work. The RW blogs today are totally despondent.
There's no other way to look at this but the best possible outcome for Obama and his re-election chances. I think that our nation full of low-information voters are going to, in large part, see this as a vindication of what Obama did.