Happy Birthday, Mr. President

EDGARTOWN, Mass: Rumor has it President Clinton will get 51st birthday cheers tonight from actor Ted Danson and his actress wife Mary Steenburgen (like Clinton, an Arkansas native) at their 19th century farmhouse on Martha's Vineyard. The White House is neither confirming nor denying that singer James Taylor, also a Vineyard local, will attend. Best presidential present: The settlement of the UPS strike.