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Republican presidential candidate Rick Santorum campaigns at The Daily Grind in Sioux City, Iowa, January 1, 2012. (JOHN GRESS/REUTERS/JOHN GRESS/REUTERS)
Republican presidential candidate Rick Santorum campaigns at The Daily Grind in Sioux City, Iowa, January 1, 2012. (JOHN GRESS/REUTERS/JOHN GRESS/REUTERS)

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Audio: Hours before Iowa Republicans vote, who is riding high? Add to ...

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