SEATTLE — Attempting to beef up an injury-riddled backfield that on Monday was held to its fewest rushing yards of the season, the Seahawks on Wednesday signed veteran running back Adrian Peterson to their practice squad. “Excited to see if he can help us out and give us a little something,” coach Pete Carroll said of Peterson, who turned 36 in March and is the fifth-leading rusher in NFL history with 14,902 yards. Carroll noted that he tried to recruit Peterson to USC before Peterson signed with Oklahoma, where he played from 2004-06. (Carroll’s USC team beat the Sooners in the Orange Bowl fo…

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