Next month will mark five years since the Affordable Care Act became law. Obamacare was supposed to be popular by now, but it’s not. And as far as President Obama and the Democrats who passed it are concerned, the law’s current approval rating might be as good as it gets. That could be a serious problem for the party in 2016.

The most recent Kaiser Family Foundation poll on Obamacare, released last week, shows that 40 percent of Americans have a favorable opinion of the law, while 46 percent have an unfavorable opinion and the rest don’t know or won’t say. There have been some slight ups and downs over the years, but public opinion seems pretty set: A plurality of Americans has disapproved of Obamacare virtually since the day it was passed.