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Mitt Romney helps collect and pack donated goods for those affected by Hurricane Sandy, in Kettering, Ohio, on Tuesday. Emmanuel Dunand/AFP/Getty Images hide caption

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Emmanuel Dunand/AFP/Getty Images

An attendee holds up a button at a speech by President Obama on Sept. 17 in Cincinnati. Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

Kimberly Fisher cast her ballot Wednesday at a polling place at the Wicomico County Youth and Civic Center in Salisbury, Md. Alex Brandon/AP hide caption

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Alex Brandon/AP

A crowd listens at a rally with former President Bill Clinton and Vice President Joe Biden in Youngstown, Ohio, on Monday. President Obama canceled his appearance to return to the White House to monitor Hurricane Sandy. Both campaigns have urged supporters whose states allow early voting to vote as soon as possible. John Moore/Getty Images hide caption

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John Moore/Getty Images

Walter Cronkite (right) listens as Dr. J. Presper Eckert (center) describes the functions of the UNIVAC I computer he helped develop in the early 1950s. AP hide caption

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AP