US President Barack Obama will hail Hillary Clinton as uniquely qualified to be the next commander-in-chief Wednesday, in a primetime speech to Democrats gathered in Philadelphia. "You know, nothing truly prepares you for the demands of the Oval Office," Obama will say, according to prepared remarks released by the White House. "But Hillary's been in the room." "I can say with confidence there has never been a man or a woman more qualified than Hillary Clinton to serve as president of the United States of America."