Roberson hit Cameron Meredith on a 29-yard pass for the go-ahead score in the fourth quarter after Collin Keoshian blocked a 45-yard field-goal try by Joey Cejudo. Roberson iced the game with a 36-yard TD run after the Penguins (7-3, 4-2 Missouri Valley) turned the ball over on downs.
Coprich tied it at 21 in the third quarter with a 1-yard run for the Redbirds (8-1, 5-1).
Roberson was 16 of 24 for 178 yards and an interception, with a 6-yard TD pass to James O'Shaughnessy. Coprich gained 107 yards on 22 carries, with a 2-yard TD run.