WASHINGTON (Reuters) – A majority of Americans still support offshore drilling on the U.S. coastline despite the devastating oil spill in the Gulf of Mexico, according to a Reuters/Ipsos poll released on Tuesday. The poll also found 89 percent of the U.S. public blame British energy giant BP Plc for the spill, the worst in U.S. history, and 69 percent think the U.S. government is also at fault. About three-quarters of the public believe neither BP nor the government responded quickly enough to the environmental disaster, which threatens wildlife, fertile fishing grounds and popular tourist beaches along the U.S. Gulf...