Oprah Winfrey threw her support behind U.S. presidential candidate Barack Obama, even though she knew it could destroy her career. The talk show queen has publicly backed Obama as her choice to replace George W. Bush next year (08). She tells the New York Daily News, "(I thought) What is the cost to me for doing it? Am I going to lose viewers? I made the decision that I have the right to do it as an American citizen. But I will not use my platform. I can use my own personal voice. "I know him well enough to believe in his moral authority. And that is the number one reason why I am supporting him."