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

itoggle caption Pete Marovich/UPI/Landov

An order of McDonald's Chicken McNuggets in Olmsted Falls, Ohio. McDonald's says it plans to start using chicken raised without antibiotics important to human medicine. Mark Duncan/AP hide caption

itoggle caption Mark Duncan/AP

Supporters of the Affordable Care Act gather in front of the U.S Supreme Court during a rally Wednesday. The court heard arguments in the case and is expected to announce its decision in June. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images

Opponents of the Affordable Care Act protest outside the Supreme Court Wednesday before oral arguments in the second major challenge to be heard by the justices. Jim Lo Scalzo/EPA/Landov hide caption

itoggle caption Jim Lo Scalzo/EPA/Landov

President Barack Obama and first lady Michelle Obama unveiled the Let Girls Learn program at the East Room of the White House on Tuesday. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Senate Majority Leader Mitch McConnell (from left), Senate Minority Leader Harry Reid and House Speaker John Boehner have reasons to watch the Supreme Court case closely — and to worry about its outcome. Drew Angerer/Getty Images hide caption

itoggle caption Drew Angerer/Getty Images

Three varieties of Kenyan purple tea from What-Cha: silver needle purple varietal white tea (from left), hand-rolled purple varietal oolong, steamed purple varietal green tea-style tea. Jeff Koehler for NPR hide caption

itoggle caption Jeff Koehler for NPR