Jason Schneider hauled in two touchdown receptions from Sumner, the second making it 35-17 at half.
Zach Zenner rushed for 132 yards on 17 carries with two touchdowns, including a 67-yard breakaway on the Jackrabbits' first play from scrimmage. He also caught a 40-yard score from Sumner, his third touchdown of the first half.
Sumner and Jake Wieneke connected three times in the third quarter, helping South Dakota State (7-4, 4-3 Missouri Valley) push to a 56-24 lead. Wieneke had 10 receptions for 159 yards and Schneider had seven for 114. Wieneke's 14 touchdown receptions this season is a new school record.