N.F.L. ROUNDUP; Steelers' Polamalu Still Out
 

The Pro Bowl safety Troy Polamalu, who has been out since Nov. 15 with a knee injury, practiced on a limited basis but is not expected to play in the Steelers' season finale against Miami, a matchup of two teams clinging to slim playoff hopes. Dolphins running back Ricky Williams is questionable because of a shoulder injury. (AP) DISCORD IN DENVER Broncos Coach Josh McDaniels said he was benching Brandon Marshall, a Pro Bowl wide receiver, for the team's pivotal season finale against the Kansas...

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