At sign-up events like this one in Los Angeles in 2013, Covered California pledged "affordability" in health insurance as one of its main selling points. Lucy Nicholson/Reuters/Landov hide caption

itoggle caption Lucy Nicholson/Reuters/Landov

One of the first signs drivers see on the way into Unionville, Mo. is this billboard advertising cardiology at Putnam County Memorial Hospital. Offering specialty services, like cardiology and psychiatry turned the hospital around, community leaders say. Bram Sable-Smith/KBIA/Side Effects Public Media hide caption

itoggle caption Bram Sable-Smith/KBIA/Side Effects Public Media

The crowd reacts as the ruling on same-sex marriage was announced outside of the Supreme Court in Washington, D.C., Friday. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Supporters of the Affordable Care Act cheer outside the Supreme Court in Washington, D.C., after a majority on the court ruled that Obamacare tax credits can continue to go to residents of any state. Mark Wilson/Getty Images hide caption

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Elly Walton/Ikon Images/Corbis

"Nearly 1 in 3 uninsured Americans have already been covered — more than 16 million people -– driving our uninsured rate to its lowest level ever," President Obama told a cheering crowd at the Catholic Health Association's annual conference Tuesday. Jonathan Ernst/Reuters/Landov hide caption

itoggle caption Jonathan Ernst/Reuters/Landov

An analysis shows the monthly premiums for many people with Obamacare policies will not much change in 2016. But the high increases of some policies are drawing fire. Rob Colvin/ImageZoo/Corbis hide caption

itoggle caption Rob Colvin/ImageZoo/Corbis

Secretary of Health and Human Services Sylvia Burwell talks before a Capitol Hill hearing Wednesday with Rep. Paul Ryan, R-Wis., as Rep. Pat Meehan, R-Pa., looks on. Getty Images hide caption

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Renee Mitchell says even though she has health insurance she'll have trouble paying for the eye surgery she needs to save her vision. Jim Burress/WABE hide caption

itoggle caption Jim Burress/WABE