Oprah Winfrey is throwing her support behind Hillary Clinton. Winfrey spoke with ET's Nancy O'Dell at the premiere of her new OWN drama, Greenleaf, and the media mogul opened up about the possibility of America electing its first female president. "I really believe that is going to happen," said Winfrey, 62. "It's about time that we make that decision.""Regardless of your politics, it’s a seminal moment for women," she continued. "What this says is, there is no ceiling, that ceiling just went boom! It says anything is possible when you can be leader of the free world."