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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Gov. Gary R. Herbert recently signed four immigration bills that bring sweeping changes to his state's laws. Here, Herbert speaks after his inauguration in January. Scott Sommerdorf/AP hide caption

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Indiana Gov Mitch Daniels speaks last month at the Conservative Political Action Conference in Washington. The speech has been called the most intellectually compelling conservative call to arms in years. Jose Luis Magana/AP hide caption

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U.S. Senate Majority Leader Harry Reid of Nevada (left), shown earlier this month, and former House Minority Leader Richard Gephardt (D-MO), pictured on Jan. 4, 1996, speak with the media about the policies related to government shutdowns. Alex Wong/Getty Images (left)/Ron Edmonds/AP (right) hide caption

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President Ronald Reagan, shown speaking on Feb. 8, 1982, has clearly been on President Obama's mind, says presidential historian Douglas Brinkley. Getty Images hide caption

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President Obama, shown during a Dec. 22 news conference, will focus largely on achieving economic recovery in his State of the Union address, says press secretary Robert Gibbs. Brendan Hoffman/Getty Images hide caption

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Former Florida Gov. Jeb Bush waves as he is introduced to the crowd during inauguration ceremonies for Republican Rick Scott on Jan. 4 outside the Old Capitol in Tallahassee, Fla. On Thursday, Bush and other Republican leaders are launching a new effort to reach out to Hispanic voters. Chris O'Meara/AP hide caption

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The Obamas depart Monday after observing a moment of silence to honor those killed and wounded during Saturday's shooting in Tucson, Ariz. Mark Wilson/Getty Images hide caption

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President Obama answers a question during a press conference in the Eisenhower Executive Office Building on Dec. 22, 2010. As the GOP takes over the House, how will the president respond to divided government? Chris Kleponis/AFP/Getty Images hide caption

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