Watch CNN's American Morning on Friday as Kiran Chetry reports on the Gulf Coast oil spill from Grand Isle, Louisiana. (Photos: Getty Images and Michael Humphrey/CNN) (CNN) – The Gulf of Mexico undersea gusher has already spilled more oil than the Exxon Valdez disaster – possibly more than twice as much, making it the largest … Continue reading Gulf of Mexico oil spill worst in U.S. history