Former Minnesota Gov. Tim Pawlenty announces in Des Moines, Iowa, that he's running for president on Monday. Steve Pope/Getty Images hide caption

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Former House Speaker Newt Gingrich speaks to local party activists Thursday in Waterloo, Iowa. Gingrich says his campaign is alive and well despite an angry response by some Republicans to earlier comments he made about a House Republican plan to dramatically change Medicare. Charlie Neibergall/AP hide caption

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House Minority Leader Nancy Pelosi (D-CA), shown with Reps. Xavier Becerra (D-CA, left) and Chris Van Hollen (D-MD), speaks at an April news conference on Capitol Hill. Pelosi says the Republicans' Medicare plan is a political boon to her party. Alex Wong/Getty Images hide caption

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A newspaper clipping from 1966 announces Mitch Daniels (second from left) as the recipient of the Graham Award, presented to the most outstanding citizen at Hoosier Boys State at Indiana University. Courtesy of The Office of Governor Mitch Daniels hide caption

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President Obama speaks as House Speaker John Boehner (second from right) and Rep. Nancy Pelosi look on during a dinner of bipartisan committee chairmen and ranking members and their spouses in the East Room of the White House on Monday. Jewel Samad/AFP/Getty Images hide caption

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