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Today may be the day the NFL Players Association files a lawsuit on behalf of Vikings running back Adrian Peterson, who is suspended by the league through mid-April.  Peterson has not played since the opening game of the season due to charges that he abused his young son.  Last month, he pleaded no contest to a reduced charge.  "USA Today" reports the suit will be filed today in federal court in Minnesota, challenging the impartiality of the arbitrator who was appointed by the NFL Commissioner. 

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