Associated Press: The Environmental Protection Agency chief on the job during the Exxon Valdez oil spill in Alaska in 1989 and a former Florida senator will lead the presidential commission investigating the Gulf of Mexico disaster. President Barack Obama on Saturday announced the appointments of William K. Reilly, EPA administrator under Republican President George H.W. Bush, and Bob Graham, a Democrat who also was Florida governor, as the panel’s heads. Obama intends to name five others to the …