Clinton Portis reacts announces his retirement from the Washington Redskins NFL football team, with sons Camdin, left, and Chaz, both four years old, during a news conference at Redskins Park in Ashburn, Va., Thursday, Aug. 23, 2012.  . (AP Photo/Richard Lipski)

Photo by: Richard Lipski

Clinton Portis reacts announces his retirement from the Washington Redskins NFL football team, with sons Camdin, left, and Chaz, both four years old, during a news conference at Redskins Park in Ashburn, Va., Thursday, Aug. 23, 2012. . (AP Photo/Richard Lipski)