Barack Obama and Oprah Winfrey by Jemal Countess/WireImage.com Barack Obama and Oprah Winfrey by Jemal Countess/WireImage.com

The "Oprah and Obama" tour arrived in South Carolina on Sunday, where the talk queen urged a crowd of nearly 30,000 to "seize the opportunity to support a man who, as the Bible says, loves mercy and does justly."

"There are those who say it's not his time, that he should wait his turn," she continued. "Think about where you'd be in your life if you'd waited when people told you to.... I'm sick of politics as usual. We need Barack Obama."

In Day 2 of campaigning for Obama, Oprah said, "I'm beginning to like this because I can feel that you are ready for change."

Next to step up for the senator might be big-screen superstar Will Smith, who tells Page Six, "I just gave [Obama] a call and asked him to tell me wherever [he thinks he needs] me. I think he's what the future of America is going to be."

Meanwhile, fellow Democrat John Edwards has some star power behind his campaign as well. Tim Robbins and Kevin Bacon have both stepped up to support Edwards in Iowa this week.