What position did Tiki Barber primarily play?

What position did John Riggins primarily play? John Riggins is best known for playing with which NFL team? Which college was John Riggins playing for when he entered the NFL? What jersey number did John Riggins wear with the Redskins? Tiki Barber is best known for playing with which NFL team? Which college was Tiki Barber playing for when he entered the NFL? What jersey number did Tiki Barber wear with the Giants? What position did Shaun Alexander primarily play?