Reuters: Top Obama administration officials demanded "immediate public clarification" from BP Plc about paying for the Gulf of Mexico oil spill in a letter released on Saturday, as the White House kept up heat on the British energy giant over the environmental disaster. "The public has a right to a clear understanding of BP’s commitment to redress all of the damage that has occurred or that will occur in the future as a result of the oil spill," Obama’s Interior Secretary Ken Salazar and …