As Obamacare erodes......

The number of U.S. adults without health insurance has grown by some 2 million this year, according to a major new survey that finds recent coverage gains beginning to erode.

The new numbers highlight what's at stake as Congress returns to an unresolved debate over Republican proposals to roll back much of former President Barack Obama's health care law.

The Gallup-Sharecare Well-Being Index, published Monday, found that the uninsured rate among U.S. adults was 11.7 percent in the second three months of this year, compared with a record low of 10.9 percent at the end of last year. Though small, the change was statistically significant, survey analysts noted.

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