Less than half of top teams have won Super Bowl

Denver Broncos running back Knowshon Moreno celebrates after scoring a touchdown during the third quarter of an NFL football game against the Oakland Raiders in Oakland, Calif., Thursday, Dec. 6, 2012. (AP Photo/Marcio Jose Sanchez) Photo by THE ASSOCIATED PRESS
Denver Broncos running back Knowshon Moreno celebrates after scoring a touchdown during the third quarter of an NFL football game against the Oakland Raiders in Oakland, Calif., Thursday, Dec. 6, 2012. (AP Photo/Marcio Jose Sanchez) Photo by THE ASSOCIATED PRESS
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