Giants legend Tiki Barber says that the Vikings need to be stern with Adrian Peterson to help him improve his ball-carrying skills. Peterson has continued to excel as a runner, but he had serious fumble issues in 2009. "I think with Adrian Peterson, he needs somebody with authority - with a strong voice - to tell him 'look, as great as a player as you are, you're a liability.' And that's what Tom Coughlin did with me," Barber told Mike Francesca on WFAN in New York. "He said 'Tiki, I love the way you play the game of football, but you fumble and you're a liability.' It hits your pride in a way that makes you want to correct it, and I don't think anybody's ever done that for Adrian Peterson yet."