Clinton Portis threw a 15-yard option pass to Lavernius Coles for a go-ahead touchdown. Portis also contributed 147 yards on 34 carries as the Redskins topped the Lions 17-10.
That drops Detroit into a tie for second in the division with Green Bay. The Packers already have a win over the Lions this season.
Meanwhile, the last-place Bears tightened up the race with a come-from-behind 28-20 win over the New York Giants.
Despite spotting NY a 14-point lead in the game's opening minute, the Bears' defense turned stingy the rest of the way.
Chicago improved to 3-5, winning their second straight.
Division leader Minnesota (5-2) travels to Indianapolis (4-3) tonight on Monday Night Football. A loss would put the Vikes a game up on the Packers as Minnesota prepares to come into Lambeau Field next weekend.