A bilingual sign stands outside a polling center at a public library ahead of local elections on April 28 in Austin, Texas. John Moore/Getty Images hide caption

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Oxfam charity volunteers wear masks depicting G-8 leaders President Obama and German Chancellor Merkel around a large caldron to draw attention to the issue of world hunger in Northern Ireland on Sunday. G-8 leaders are gathering there for an annual summit. Peter Muhly/AFP/Getty Images hide caption

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Bruce Springsteen performs during halftime of the Super Bowl in Tampa, Fla., in 2009. In music, and increasingly in other industries, a relative handful of top performers take more and more of the spoils, says White House chief economist Alan Krueger. Mark J. Terrill/AP hide caption

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President Obama announces in the White House Rose Garden on Tuesday his nominations of (from left) Robert Wilkins, Cornelia Pillard and Patricia Millett to fill vacancies on the U.S. Court of Appeals for the District of Columbia. Mark Wilson/Getty Images hide caption

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President Obama, with Education Secretary Arne Duncan at his side, calls on Congress on June 21, 2012, to stop interest rates on student loans from doubling. He is going to make that appeal again Friday. Susan Walsh/AP hide caption

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Voters leave the Old Blanco Courthouse in Blanco, Texas, after casting their ballots in November 2012. Democrats hope demographics and a new organizational push give them a brighter future in Texas. Eric Gay/AP hide caption

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The Treasury Department announced this week it will pay down some of its debt for the first time in six years. Jacquelyn Martin/AP hide caption

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Humberto Manzano Jr. moves a pallet of goods at an Amazon.com fulfillment center in Phoenix in 2010. Amazon has endorsed a bill making its way through the Senate that would require more online retailers to collect sales tax. Ross D. Franklin/AP hide caption

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President Obama urged Congress to take action on measures to protect children from gun violence while speaking in the East Room of the White House last week. Standing with Obama are Vice President Joe Biden and, according to the White House, law enforcement officials, victims of gun violence and others, whom the White House did not want to name. Susan Walsh/AP hide caption

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President Obama speaks to reporters in the White House briefing room on Friday following a meeting with congressional leaders. Pablo Martinez Monsivais/AP hide caption

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President Obama is expected to nominate Gina McCarthy, currently assistant administrator with the Environmental Protection Agency, to head the agency on Monday. The nomination requires a Senate confirmation. Alex Brandon/AP hide caption

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Transportation Secretary Ray LaHood (left) answers questions during a briefing with White House Press Secretary Jay Carney on Friday. Win McNamee/Getty Images hide caption

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President Obama speaks about strengthening the middle class and the nation's struggle with gun violence at Hyde Park Academy in Chicago on Friday. M. Spencer Green/AP hide caption

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President Obama plays a learning game while visiting children at College Heights Early Childhood Learning Center on Thursday in Decatur, Ga. Obama's campaign-style trip this week was to end with a nonworking stop in Florida. Brendan Smialowski/AFP/Getty Images hide caption

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