Minnesota Vikings running back Adrian Peterson smiles while walking off the field 

Minnesota Vikings running back Adrian Peterson smiles while walking off the field after the Vikings' NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2012, in Minneapolis.  Peterson rushed for 199 yard as the Vikings won 37-34. (AP Photo/Genevieve Ross)
Associated Press
Minnesota Vikings running back Adrian Peterson smiles while walking off the field after the Vikings' NFL football game against the Green Bay Packers on Sunday, Dec. 30, 2012, in Minneapolis. Peterson rushed for 199 yard as the Vikings won 37-34. (AP Photo/Genevieve Ross)
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