There's already one candidate taking herself out of the 2012 presidential contest: Secretary of State Hillary Clinton, who failed to win the Democratic nomination in 2008.
Clinton, on an overseas trip to New Zealand, told reporters the U.S. is ready for a woman president but it won't be her.
Asked by TV3 New Zealand whether she has ruled out standing for the White House through 2016, Clinton replied: "Oh yes, yes. I'm very pleased to be doing what I'm doing as secretary of state," according to Reuters.
Clinton also said she hoped the United States was ready for a female president, adding that "it should be."
Asked if it might be her, she replied: "Well, not me. But it will be someone and it is nice coming to countries that have already proven that they can elect women to the highest governing positions that they have in their systems."
New Zealand has had two female prime ministers. The country is Clinton's second-to-last stop on her Asia-Pacific tour; she next heads to Australia.
President Obama is up for reelection in 2012 and, if he won reelection, would be out office in 2016. Clinton could stay in the Cabinet throughout his tenure.