Steam from a coal-fired power plant is silhouetted against the sun near St. Marys, Kan. Industry groups say there should be a far more aggressive consideration of costs of regulation than the Obama administration took into account. Charlie Riedel/AP hide caption

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University of Notre Dame contends that the act of signing a form opting out of the Affordable Care Act's birth control mandate makes the school complicit in providing coverage. Getty Images hide caption

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Fans and foes of Obamacare jockeyed for position outside the Supreme Court Wednesday. Inside, the justices weighed arguments in the case of King v. Burwell, which challenges a key part of the federal health law. Pete Marovich/UPI/Landov hide caption

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Supporters of the Affordable Care Act celebrate outside the Supreme Court in 2012, after a divided court upheld the law as constitutional by a 5-to-4 vote. The latest battle, which the Supreme Court hears Wednesday, is over whether people who buy insurance through federally run exchanges are eligible for subsidies. David Goldman/AP hide caption

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When lawyer Thomas Goldstein contended that innkeepers keep guest information anyway to stay in touch with their customers, Justice Scalia cut in: "Motel 6 does this? Jeez, I've never received anything from them!" iStockPhoto hide caption

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Arizona commission attorney Mary O'Grady (left) and Stephen Miller, a city council member, point to a possible redistricted map in 2011. Ross D. Franklin/AP hide caption

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Arizona state Sen. Andy Biggs flips through redistricting maps during a special legislative committee hearing to discuss the state commission's proposed maps in 2011. Ross D. Franklin/AP hide caption

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Want to get your teeth whitened? You may soon have more options. The U.S. Supreme Court ruled Wednesday that a state board of dentistry unfairly drove competitors out of business by trying to block non-dentists from providing whitening services. Vince Bucci/Getty Images hide caption

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