On her first visit to Britain since husband Barack became US president, Michelle Obama dazzled London with her signature classic style Wednesday, leading one newspaper to dub her "Mighty Michelle". The First Lady accompanied her husband to Downing Street first thing for breakfast with British premier Gordon Brown and his wife Sarah before the men discussed Thursday's G20 summit and the women visited a cancer care centre. Later, she was to meet "Harry Potter" author J.K. Rowling when she sits next to her at a pre-summit dinner. Michelle Obama's understated chic has injected a welcome dash of class into the...