Trying to end a four-game skid, the Lions went home for a Week 14 intraconference duel with the Dallas Cowboys.  In the first quarter, Detroit struck first with RB T.J. Duckett getting a 32-yard TD run, while kicker Jason Hanson getting a 19-yard field goal.  In the second quarter, the Cowboys got on the board with RB Marion Barber getting a 20-yard TD run. The Lions would respond with Hanson nailing a 36-yard field goal, while RB Kevin Jones getting a 2-yard TD run.  Dallas would end the half with QB Tony Romo completing an 8-yard TD pass to Barber. In the third quarter, Detroit replied with Jones getting a 3-yard TD run for the only score of the period.  However, in the fourth quarter, the Cowboys came back and won with Barber getting a 1-yard TD run, followed by Romo's 16-yard TD pass to TE Jason Witten.
Question: who is the cowboys runningback?
Answer: Marion Barber