Republican presidential candidate Mitt Romney speaks during a town hall event in Peterborough, N.H., on Saturday. Michael Dwyer/AP hide caption

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Ross Perot, shown on a video screen, addresses the Reform Party's national convention in July 1999 in Dearborn, Mich. The billionaire founder of the Reform Party, Perot ran for president as a third-party candidate in both 1992 and 1996. Jeff Kowalsky/AFP/Getty Images hide caption

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President Obama greets diners in Los Angeles last month. He faces long odds in his quest for re-election. Among them: unemployment, eroding support among independent voters and approval ratings that are well below those of previous presidents who won a second term. Jewel Samad /AFP/Getty Images hide caption

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A sign at an Occupy D.C. protest reads "Fed Owns Obama." The president has so far had the worst of both worlds, with much of Wall Street convinced he's anti-business, and the protesters convinced he's in bed with the banks.

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A new ad from Herman Cain features his campaign manager, Mark Block, taking a drag from a cigarette.

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Former Massachusetts Gov. Mitt Romney (left) and Texas Gov. Rick Perry got into a heated exchange about immigration during Tuesday's GOP presidential debate in Las Vegas.

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Republican presidential candidate Herman Cain participates in a presidential debate at Dartmouth College in Hanover, N.H., on Tuesday.

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The partisan divide on national security has shrunk. Many Republicans praise President Obama's handling of the issue.

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Texas Gov. Rick Perry speaks at the Conservative Political Action Conference this month in Orlando, Fla. The next day, he finished a disappointing second in the Florida GOP straw poll. Mark Wilson/Getty Images hide caption

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