Former Washington Redskins running back Clinton Portis, right, and team owner Daniel Snyder hug after Portis officially announced his retirement from NFL football during a news conference at Redskins Park, Thursday, Aug. 23, 2012, in Ashburn, Va. Portis finished as the second-leading rusher in Redskin history. (AP Photo/Richard Lipski)
FILE - In this Sept. 2, 2010, file photo, Washington Redskins running back Clinton Portis watches from the sidelines during a preseason NFL football game against the Arizona Cardinals in Glendale, Ariz. Portis is hoping for another chance with the Redskins. The running back said Thursday, Dec. 2, 2010, he wants to keep playing, despite back-to-back seasons that have ended early because of injuries. (AP Photo/Ross D. Franklin, File)
Washington Redskins quarterback Donovan McNabb (5) looks to hand the ball off to running back Clinton Portis, left, during practice at the NFL football team's facility, Wednesday, Sept. 29, 2010, at Redskins Park in Ashburn, Va. (AP Photo/Nick Wass)
Washington Redskins running back Clinton Portis is stopped short of the goal line by Houston Texans linebacker DeMeco Ryans during the first half of an NFL football game in Landover, Md., on Sunday, Sept.. 19, 2010. Portis scored on the next play. (AP Photo/Nick Wass)
Washington Redskins running back Clinton Portis is stopped short of the goal line by Houston Texans linebacker DeMeco Ryans during the first half of an NFL football game in Landover, Md., on Sunday, Sept.. 19, 2010. Portis scored on the next play. (AP Photo/Nick Wass)
Washington Redskins' running back Clinton Portis rushes for a 1-yard touchdown against the Houston Texans during the second quarter at FedEx Field in Washington on September 19, 2010. UPI/Kevin Dietsch
Washington Redskins running back Clinton Portis gives the ball to the fans after scoring during the first half of an NFL football game against the Houston Texans in Landover, Md., on Sunday, Sept. 19, 2010. (AP Photo/Evan Vucci)
Washington Redskins running back Clinton Portis gives the ball to the fans after scoring during the first half of an NFL football game against the Houston Texans in Landover, Md., on Sunday, Sept. 19, 2010. (Associated Press)
ASSOCIATED PRESS FILE - This Sept. 2, 2010, file photo shows Washington Redskins running back Clinton Portis watching from the sidelines during a preseason NFL football game against the Arizona Cardinals, in Glendale, Ariz.
