The Kaiser Family Foundation's latest poll on public opinion of the Affordable Care Act, aka Obamacare, has found the law is more unpopular with Americans than ever before. Kaiser found in its July survey that 53 percent of Americans say they have an unfavorable opinion of the law, with just 37 percent saying they have a favorable opinion. That's among the lowest favorability rating Obamacare has ever received, and it's the highest unfavorability rating since Kaiser first began its monthly poll of Obamacare in April 2010.

The Washington Post has more:

As the foundation notes, more people seemingly made up their minds about the law last month. The rate of those without an opinion on the Affordable Care Act dropped from 16 percent in June to 11 percent in July.

Historically, public opinion on the ACA hasn't changed much since it was enacted, despite some notable monthly swings. Kaiser pollsters said it's not clear what drove the change in opinion this month.

"Normally, when negatives go up, you can tie it to an event," said foundation chief executive Drew Altman in an interview. Events like a broken enrollment Web site, or people losing their health plans.

That doesn't seem to be case here, though.

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