"Angry" Obamacare opponents are "more mobilized" for the 2014 midterm elections than the health care law's beneficiaries, according to a longtime adviser to President Obama.

David Axelrod, an Obama veteran who is now advising Britain's Labour Party, told the New York Times that Obamacare suffers from a public perception problem.

Obamacare is viewed "more as a social welfare program than a social insurance program," Axelrod said, "but that's not right because it is social insurance."

Axelrod's distinction is questionable given the massive Medicaid expansion within Obamacare, but he's right to identify the current political problem faced by his party. Core Obama constituencies, particularly young voters and minorities, tend to vote at lower levels in midterm elections, yet those same people are expected to be among the major beneficiaries of the new healthcare law.

But the task of separating Obamacare's opponents from defenders is not always as simple as the difference between Republican and Democrat.

As the Washington Examiner's Byron York explained last week, there is really only one question that matters when it comes to the politics of Obamacare. "How many Americans are benefiting from the new health care system," York asked, "and how many are hurting?"

The answer to that question is likely to have a huge impact on November's elections.