Sarah Palin (center) stands with the Wasilla, Alaska, City Council for a portrait in 1998. In 1992, then-Mayor John Stein recruited Palin as a moderate counterweight to the growing anti-government, anti-tax movement. By 1996, Palin challenged Stein in the race for mayor — and won. Heath Family/AP hide caption

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Obama also offered to show his live birth video at the White House Correspondents Association Dinner Saturday night, which turned out to be a clip from the Disney film, The Lion King. Manuel Balce Ceneta/AP hide caption

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Jon Huntsman, the outgoing U.S. ambassador to China, briefs reporters in November 2009. If Huntsman joins the field of presidential candidates, he may have a difficult time explaining to Republican primary voters why he worked for a Democratic president. Charles Dharapak/AP hide caption

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Defense Secretary Robert Gates talks with troops during a visit April 7 at Camp Victory in Baghdad. Chip Somodevilla/Getty Images hide caption

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U.S. Rep. Paul Ryan, R-Wis., right, hears from a constituent during a "listening session" Tuesday at Gateway Technical College in Kenosha, Wis. Ryan's plan to fundamentally restructure Medicare and cut social safety net programs has proved to be a tough sell to many Republican voters the last few weeks. Jeffrey Phelps/AP hide caption

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Deputy High Commissioner for Human Rights Kyung-Wha Kang of Korea speaks during a special session of the UN Human Rights Council in Geneva Friday. The council agreed to launch an urgent investigation into Syria's bloody crackdown on protests. Fabrice Coffrini/AFP/Getty Images hide caption

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A Tea Party supporter, left, argues with a critic before a rally where former Alaska Gov. Sarah Palin spoke at the Wisconsin State Capitol in Madison on April 16. Darren Hauck/Getty Images hide caption

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