Garret Graves with the Coastal Protection and Restoration Authority collects an oil sample in Pass A Loutre near Venice, Louisiana May 26, 2010. Louisiana Governor Jindal gave a tour of the area to reporters showing the damage of the oil spill. BP launched an ambitious deep sea operation to choke off a gushing oil leak in the Gulf of Mexico on Wednesday, but President Barack Obama cautioned Americans there was no guarantee it would work. BP is under intense pressure from Obama to bring a swift end to the five-week-old spill that threatens an environmental catastrophe and has ignited a political storm. REUTERS/Sean Gardner (UNITED STATES - Tags: DISASTER ENVIRONMENT BUSINESS ENERGY IMAGES OF THE DAY)