Republican presidential candidate Mitt Romney and vice presidential candidate Paul Ryan on stage with their wives Ann Romney and Janna Ryan at the Republican National Convention on Aug. 30. Jae C. Hong/AP hide caption

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Schoolchildren tour the bus that civil rights icon Rosa Parks made famous when she refused to give up her seat. Bill Pugliano/Getty Images hide caption

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President Obama waves after signing the Affordable Care Act at the White House on March 23, 2010. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images