U.S. Sen. David Vitter, R-La., alleged Tuesday that BP is "actively trying to walk away" from its obligations to clean up the Gulf oil spill, and that the Coast Guard is not doing enough to hold the British oil giant responsible.The state's junior senator also took aim at the Coast Guard, which is in charge of the oil spill cleanup, saying that it has "developed too cozy a relationship with BP."Read More... More on Gulf Oil Spill