DES MOINES, Iowa — Television star Oprah Winfrey, an influential voice in American popular culture and one of the most successful blacks in the world, urged Iowans on Saturday to use their first-voting status to give Barack Obama the momentum to overtake Hillary Clinton for the Democratic presidential nomination. "I'm here to tell you, Iowa, he is the one," the billionaire, philanthropist and top-rated talk-show host told a crowd estimated at more than 15,000 who navigated snow-crusted roads to see her stump for the Illinois senator at Hy-Vee Hall in Iowa's capital city. Without naming Clinton, Winfrey argued that Obama's...
