The Medical Loss Ratio (MLR) provision of the Affordable Care Act is "working the way we hoped it would," Sen. John D. Rockefeller IV, D-W. Va., said today at a contentious Senate hearing during which Republicans challenged aspects of the law.

"The minimum medical loss ratio is a very simple idea, but it appears to have had a powerful, and very positive, effect on the health insurance market," Rockefeller said at the hearing of the Commerce, Science & Transportation Committee he chairs.

"I understand that there are people in this country–maybe even here in this room–who find it hard to concede that anything good has or will come from the Affordable Care Act," Rockefeller said. "But I think it's pretty clear at this point that this piece of the law is."

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