Michigan State might not quite be done yet.
Tyler O'Connor found Donnie Corley on a 9-yard touchdown pass, capping a 5-play, 76-yard drive.
However, the Spartans couldn't make the two-point conversion happen, and are down 47-37 midway through the fourth quarter.
Northwestern pads lead in 4Q
Justin Jackson's 29-yard touchdown run in the fourth quarter — his second of the day — padded Northwestern's lead over Michigan State.
Jack Mitchell's extra point made it 47-31.
The Spartans defense was almost nonexistent on the 13-play, 91-yard scoring drive. Only two of the plays — the touchdown and a 16-yard pass from Clayton Thorson to Austin Carr on third-and-6 — were 10 yards or longer.