President Obama tours Conveyor Engineering and Manufacturing in Cedar Rapids, Iowa, on Wednesday. Jewel Samad/AFP/Getty Images hide caption

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Occupy Wall Street members stage a protest march near Wall Street in New York in October. Paul Taylor of the Pew Research Center says the movement has "crystallized" the idea of economic disparity. Emmanuel Dunand/AFP/Getty Images hide caption

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In his New Hampshire primary victory speech Tuesday, Mitt Romney chided GOP rivals for challenging his record as the former head of a private equity firm. Justin Sullivan/Getty Images hide caption

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Mitt Romney, when he headed Bain Capital. David L. Ryan/Boston Globe via Getty Images hide caption

itoggle caption David L. Ryan/Boston Globe via Getty Images