If he is elected, it is highly unlikely he will dismantled the HC law. Instead, he will infuriate the Tea Baggers by making changes to it and perhaps scale it back some of its programs. He won't be able to completely do away with it.
Of course, we all know he doesn't want to anyway, being a moderate and all.[/B]
Undoubtedly true.
Best case scenario:
This summer, the SCOTUS stikes down the mandate, and rules it inseparable from PPACA - Paul Naders the Republicans, and either endorses, or runs on, the Libertarian ticket, not winning, but building momentum for the cause. Obama wins but faces a congress that (hopefully) will come up with something better than PPACA. That last bit is where my scenario might dip into fantasy.