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WASHINGTON (AP) – A new report from the Centers for Disease Control and Prevention finds that progress reducing the number of Americans without health insurance is threatening to stall this year.

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The uninsured number dipped by only 200,000 people between 2015 and the first six months of this year, according to the CDC’s National Health Interview Survey. The report’s authors are calling that “a nonsignificant difference.”

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The study suggests that President Barack Obama’s legacy health care law may be reaching a limit to its effectiveness, with the nation politically divided over the government’s proper role in guaranteeing coverage.

About 28.4 million people were uninsured this year in the period from January through June.

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