The gurney in the the execution chamber at the Oklahoma State Penitentiary in McAlester, Okla. On Monday the Supreme Court voted 5-4 in a case from Oklahoma that the sedative midazolam can be used in executions without violating the prohibition on cruel and unusual punishment. Sue Ogrocki/AP hide caption

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Supporters of same-sex marriages gather outside the U.S. Supreme Court on April 28, in Washington, D.C. Mladen Antonov/AFP/Getty Images hide caption

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A plume of steam billows from the coal-fired Merrimack Station in Bow, N.H. in January 2015. Jim Cole/AP hide caption

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A crowd waves rainbow flags during the Heritage Pride March in New York on Sunday. Kathy Willens/AP hide caption

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As a staff member takes down the Arizona redistricting map, Arizona Independent Redistricting Commission chair Colleen Mathis gets a hug from Frank Bergen, a Pima County Democrat, at a 2012 meeting. Ross D. Franklin/AP hide caption

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People gathered near the White House on Friday evening to see it lit in rainbow colors as a commemoration of the Supreme Court's ruling to legalize same-sex marriage. Pablo Martinez Monsivais/AP hide caption

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Gay rights advocates John Lewis (left), and his spouse Stuart Gaffney kiss across the street from City Hall in San Francisco, on Friday following a ruling by the U.S. Supreme Court that same-sex couples have the right to marry nationwide. Jeff Chiu/AP hide caption

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People celebrate outside the Supreme Court in Washington on Friday after its historic 5-4 decision on same-sex marriage. Mladen Antonov/AFP/Getty Images hide caption

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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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On July 9, 2013, opponents and supporters of a bill to put restrictions on abortion hold signs near a news conference outside the Texas Capitol in Austin. The bill was passed, but has been battled in the courts for two years; now, the law is set to go into effect July 1. Eric Gay/AP hide caption

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Supporters of the Affordable Care Act rally in front of the U.S. Supreme Court in Washington, D.C., on March 4. The Supreme Court is considering the case of King v. Burwell, which could determine the fate of health care subsidies for millions of people. Alex Wong/Getty Images hide caption

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A Tea Party supporter rings a bell in protest of the health care law in front of the U.S. Supreme Court, as Obamacare supporters shout behind her. Alex Wong/Getty Images hide caption

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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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