A group of workers comb the public beach of Grand Isle, Louisiana, to pick up trash in the hours before President Barack Obama's visit on Friday, May 28, 2010. It was their first day working on the beach, where oil had appeared days earlier, but washed away with the tides. (Carolyn Cole/Los Angeles Times/MCT)
A group of workers comb the public beach of Grand Isle, Louisiana, to pick up trash in the hours before President Barack Obama's visit on Friday, May 28, 2010. It was their first day working on the beach, where oil had appeared days earlier, but washed away with the tides. (Carolyn Cole/Los Angeles Times/MCT) Carolyn Cole / Los Angeles Times /MCT
A group of workers comb the public beach of Grand Isle, Louisiana, to pick up trash in the hours before President Barack Obama's visit on Friday, May 28, 2010. It was their first day working on the beach, where oil had appeared days earlier, but washed away with the tides. (Carolyn Cole/Los Angeles Times/MCT) Carolyn Cole / Los Angeles Times /MCT

Oil spill taking toll on BP's credibility — and the government's

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