Its official (well, semi). Hillary Clinton can now blame her defeat squarely on Oprah Winfrey (or Barack Obama can thank Oprah for his victory). Weve long known that Oprah has had the power to make a book a #1 best seller lists and to boost the sales of any product that she displays on her show. And, now, she may be single-handedly responsible for Obama winning the Democratic nomination for the presidency (see video of endorsement). Well, thats at least the conclusion one can reach after reading