President Barack Obama, with daughters Sasha, far right, and Malia does some Christmas shopping at a small bookstore, One More Page, in Arlington, Va., on Saturday. He used his BlackBerry, apparently to look up a book title as he spoke with shop owner Eileen McGervey. The White House said Obama was promoting “Small Business Saturday” to encourage shoppers to patronize mom-and-pop businesses after Thanksgiving and Black Friday. The president said “preparation” was the key to his shopping. Obama bought 15 children’s books that will be given as Christmas gifts.