Tiki Barber knows Adrian Peterson's pain. After Peterson fumbled twice in the Vikings' loss in the NFC title game and played a role in a botched handoff, there's plenty of angst regarding his fumbling. "He's becoming a liability for his team," Barber told WFAN in New York on Monday, according to sportsradiointerviews.com.

http://www.fannation.com/truth_and_rumors/view/153070-barber-peterson-becoming-vikings-liability?eref=fromSI

Well if anyone's an expert on this subject it's Tiki!