Re-visiting the health care law doesn't seem likely. Obama already got pretty much what he wanted from the law, so he has very little reason to want to change it.
He got most of what he wanted, but not a bipartisan imprimatur, which is important and which he surely has wanted from the beginning. Only it hasn't been explicitly stated by him. I'm proposing a subtle but significant tweak in how he presents his outlook on the law to the American people. It would be something that's been true all along but which is being reemphasized now. Surely that much can be allowed him. Of course I'm not proposing any actual action by Congress; merely more explicit statements about how he would work with Boehner if he won.
Well yes, it would be a reelection ploy, duh. But it would also be a genuine offer. Is Romneys new promise to walk back his tax cut pledge a ploy? Yes; he would not be doing it if he thought it hurt him politically. But he's still allowed to do it. Campaigns are times where the issues are discussed in detail and it shouldn't be a surprise if the candidates refine and home their messages. It's good for the country too.
I don't think it requires anything by Congress to propose. If Boehner ignores it, he cedes the field to Obama. If he rejects it, he makes the GOP look unreasonable and underscores the Dems' point about a do nothing Congress. If he accepts it, then Obama can say his proposal is bipartisan.