U.S. media celebrity Oprah Winfrey said President Obama is a "masterful leader" and expressed confidence he will be re-elected.
Winfrey, who heavily campaigned for Obama in 2008, said this time she didn't feel the urgency to formally endorse him because he is so well known, CNN reported Friday.
"I don't need to endorse him because I am a 100 percent supporter of him and I've already endorsed him," Winfrey said.
"If he or his office called me tomorrow and said that they needed me I would do whatever I thought would be of service. I did what I did in 2008 because I really thought that would be of value and of service. I don't think that's needed in 2012," she said.
"There's not a person in the world who doesn't know who Barack Obama is," Winfrey said during the interview conducted in Johannesburg, South Africa, where she is marking the graduation of the first students who attended a school academy she established five years ago.
Seventy-two students will graduate Saturday from the Oprah Winfrey Leadership Academy for Girls, which offers education for girls from poor backgrounds.
Winfrey said she's confident Obama will be re-elected.
"I think he is a masterful leader," she said.
Jobs, the economy and "building a sense of confidence in the American people so that they know that their futures can be sustainable" would be the biggest challenges for Obama, Winfrey said.
