Immediately after ObamaCare was passed, conservatives and libertarians have been calling for its repeal. In some ways, Romney may have hurt himself as a candidate because his mandate for health care in Massachusetts was effectively the beta version of ObamaCare. I don't believe it should particularly matter whether Romney will repeal a copy of his own bill, and that's not because I'm a fan of ObamaCare. You can read through my blog to find that's not the case.
Rather, I believe the Supreme Court is the only thing that matters now. If they uphold the individual mandate, repeal means nothing. Politicians on both sides (though particularly the Left) will undoubtedly abuse this power. ObamaCare, as bad as it is, is just the beginning. It isn't enough to close the lid on Pandora's Box. The Court effectively decides whether we will open that box or not.
If ObamaCare's repeal is an issue in October, liberty has lost already. That said, Obama absolutely must be defeated in order to prevent a Court from being tipped to the left.