The Dublin-based prediction market site Intrade lets users bet money on whom they expect to win a variety of U.S. political races, including the presidential race. NPR/Intrade screen grab hide caption

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Republican presidential candidate Mitt Romney shakes hands during a rainy campaign rally Monday in Newport News, Va. Evan Vucci/AP hide caption

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President Obama speaks during a campaign event at George Mason University in Fairfax, Va., on Friday. Pablo Martinez Monsivais/AP hide caption

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Federal Reserve Chairman Ben S. Bernanke in a hearing of the Joint Economic Committee on Capitol Hill in June. Brendan Smialowski/AFP/Getty Images hide caption

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Paul Ryan waves as he takes the stage at the Republican National Convention in Tampa, Fla., on Aug. 29. Ryan has been celebrated as a deficit hawk with bold vision, but some critics have called his record on deficit-reduction "dismal." Chip Somodevilla/Getty Images hide caption

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House Budget Committee Chairman Paul Ryan, R-Wis., shakes hands with Federal Reserve Chairman Ben Bernanke at the close of the committee's hearing on the state of the economy in February 2011. J. Scott Applewhite/AP hide caption

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Police wait for protesters to appear at a branch of Barclays Bank in London on July 4. Olivia Harris/Reuters/Landov hide caption

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Over the last 13 years, the euro has been worth on average $1.21, only a penny less than its current price of $1.22 per euro. Michael Probst/AP hide caption

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Critics of Germany's spending policy created effigies of Chancellor Angela Merkel (center) and other German leaders to stand near the chancellery in Berlin. Sean Gallup/Getty Images hide caption

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Kevin Hill, a San Diego landscape designer, was doing well financially before the downturn. Now, he says he feels "lost." John Ydstie/NPR hide caption

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People walk past the Bank of Greece headquarters in Athens. Louisa Gouliamaki/AFP/Getty Images hide caption

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A supporter of French President-elect Francois Hollande wears a mask of outgoing President Nicolas Sarkozy. Thomas Coex/AFP/Getty Images hide caption

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