(June 2) -- Paul McCartney is a man known for his words, usually when they're set to music. But he chose some special ones at the Library of Congress to praise President Barack Obama, before whom he will soon be performing: Let him be. "I have to say I'm a big fan, he's a great guy," McCartney said at a Washington news conference Tuesday that was attended by politicians as well as journalists. "So lay off him, he's doing great." ... Perhaps as an example of his global concerns, McCartney called the BP oil spill in the Gulf of Mexico...