EPA Administrator Lisa Jackson looks at an oil sample she scooped from the water as she tours marshes affected by the Deepwater Horizon oil spill in Pass a Loutre, La. Gerald Herbert/AP hide caption

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Oil covers a marshy area near Venice, La. Communities in southeastern Louisiana are bracing for the worst. John Moore/Getty Images hide caption

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Rep. David Obey (D-WI) announces his retirement at a news conference in Washington, D.C., on May 5. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images