While Republican critics of the law have occasionally dabbled with fantastical predictions that Obamacare wouldn’t accomplish its goal of expanding health insurance to more Americans (some even claimed — or claimed to claim — that it would increase the number of uninsured Americans). 

The evidence has been gathering for a year and a half that, not surprisingly, a law that expands coverage options for Americans is dramatically reducing the number of folks without health insurance. 

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Here’s another data point. The Centers for Disease Control just released their massive National Health Interview Survey. They found, in the first year of Obamacare’s coverage expansion, a decrease of 8.8 million Americans without insurance on the day they were surveyed (amounting to a 20 percent decline in the uninsurance rate). The percentage of uninsured Americans is falling to the lowest levels it has been in at least fifteen years. More recent Gallup polling suggests that these gains have continued in 2015, the second year of Obamcare’s coverage expansion. 

Of course, if the plaintiffs win in King v. Burwell — and Congress and red-state legislatures fail to act — some of these gains could be reversed, potentially leading to more than 8 million uninsured Americans in 2016. 

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