Nebraska Cornhuskers running back Mekhi Nelson was arrested in Florida after an alleged altercation with his pregnant girlfriend ... TMZ Sports has learned. The redshirt sophomore was taken into custody around noon at the Blue Flamingo Resort Key West and transported to a nearby jail and booked for misdemeanor battery. According to the police report, officers responded to a call for a disturbance at 11:39 AM. Once they got to Nelson's room, cops say he answered the door and stated he was in an