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A campaign worker hangs a sign at a campaign stop for Republican presidential candidate Mitt Romney in Lorain, Ohio, on Thursday. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

President Obama announces support for building an oil pipeline from Oklahoma to Texas, Thursday in Cushing, Okla. Tom Pennington/Getty Images hide caption

itoggle caption Tom Pennington/Getty Images

A driver pumps gas into his Toyota Prius hybrid at a gas station in Sunnyvale, Calif., in 2007. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP