SAN FRANCISCO, CA - JANUARY 02: Tim Hightower #34 of the Arizona Cardinals is tackled by Nate Clements #22 and Shawntae Spencer #36 of the San Francisco 49ers during an NFL game at Candlestick Park on January 2, 2011 in San Francisco, California. (Ph.
SAN FRANCISCO, CA - JANUARY 02:    Tim Hightower #34 of the Arizona Cardinals is tackled by Nate Clements #22 and Shawntae Spencer #36 of the San Francisco 49ers  during an NFL game at Candlestick Park on January 2, 2011 in San Francisco, California.  (Ph