Jonathan Bernstein at Bloomberg View:
For most of us, ObamaCare isn’t that visible, and the benefits often are the least visible part. The biggest winners are probably those on expanded Medicaid, and I’m confident many of them don’t know they were helped by ObamaCare. Don’t expect it to get better; it’s going to be less and less likely that people will identify the benefits they are receiving with “ObamaCare.” In five years, plenty of those in the exchanges won’t realize that under the old system they would have had a pre-existing condition that would have barred them from being insured. Even if they realize that such a restriction once existed, they almost certainly won’t realize that their minor medical condition would have qualified.
Given all that, once Republican opposition guaranteed that the ACA would be controversial it was likely that it would poll badly, even if it worked well — and even if it worked so well it couldn’t be repealed.