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Olympic gold medalist swimmer Aaron Piersol and Actress Kate Walsh attend a rally to mark the one-year anniversary of the BP oil spill in Washington

Olympic gold medalist swimmer Aaron Piersol and Actress Kate Walsh attend a rally to mark the one-year anniversary of the BP oil spill in Washington

Actress Kate Walsh talks to Olympic gold medalist swimmer Aaron Piersol as they attend a rally to mark the one-year anniversary of the BP oil spill and to urge Congress to stop offshore drilling and start a clean energy revolution, in Washington, DC on April 20, 2011. UPI/Kevin Dietsch

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