University of Louisville coach Bobby Petrino confirmed that he turned down the Oakland Raiders job for the third time, including another proposal on Wednesday night that would have paid him $18 million over five years. Petrino told ESPN's Chris Mortensen that he was flattered by the Raiders' persistence but that he was committed to Louisville and did not feel his family was ready for a move. Petrino is the only coach to whom the Raiders have offered the position. Former Raiders coach Art Shell has now emerged as the front-runner to return to his former job, ESPN has learned. Current San Diego Chargers receivers coach James Lofton also remains in the running, Mortensen reports. A Raiders source also told Mortensen that there is yet another "mystery candidate" with considerable NFL experience.