LINCOLN, Neb. (AP) – Northwestern brings its spread offense to Nebraska on Saturday, the kind the ninth-ranked Huskers used to go against week after week in the Big 12.  Cornhuskers defensive coordinator says Northwestern’s Dan Persa is close to if not the best quarterback Nebraska has faced.  Persa has been sharing time with the versatile Kain Colter, and the pair has combined to throw for 289 yards a game in Big Ten play.  Nebraska has been playing some of its best defense the last two games, holding Minnesota and Michigan State under 300 total yards.  Nebraska (7-1, 3-1 Big Ten) has won three straight to move into a three-way tie for the lead in the Big Ten’s Legends Division.  Northwestern (3-5, 1-4) is playing its final road game and needs to win three of its last four to become bowl eligible.