Despite predictions by Democrats that President Obama's health care law would become more popular once it was passed, more than two years later, a new WSJ/NBC poll finds the legislation is still deeply unpopular.

According to the poll, just 36 percent of respondents say the law was a "good idea" compared with 45 percent who say it's a bad idea. Furthermore, 49 percent favor "repealing and eliminating" the law, compared with just 42 percent who favor keeping it.

Though these numbers are encouraging, unfortunately for conservatives, the ability of Republicans to take full advantage of this vulnerability is severely constrained by the fact that they are poised to nominate Mitt Romney, who signed the Massachusetts law that was the model for Obamacare.

It's true that it would be a big boost to Romney if the the U.S. Supreme Court strikes down Obama's health care law. That way, Romney could say that his Massachusetts law was constitutional while Obama's was not. However, the underlying policy similarities between the two laws will make it easier for the Obama campaign to muddy the waters on health care than if the Republicans had nominated a candidate who didn't carry Romney's baggage on the issue.