WASHINGTON — In an unanticipated move, the Obama dog who has captivated the nation has endorsed the U.S. Public Service Academy.  The pooch has been making a sensation across the world, making a splash in Britain, racing through the White House, and bowling over the White House Press Corps.  Sources close to the curly-haired black-and-white Portuguese water dog describe his support for the Academy as “adorable and frenetic.”  The move was announced early Wednesday after Bo was found dashing through the White House wearing the Academy t-shirt, knocking over chairs and escaping into the Rose Garden.  No word yet on Michelle’s tomatoes.