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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