Alexander hit Nate Bennett with a 44-yard touchdown pass on the Vikings' first possession and Malik Walker punched in from the 5 on their second to spark a 17-0 first-quarter lead. Alexander then hit Beau Kelly with a pair of touchdown passes to push the lead to 31-7 in the third quarter.
Hunter Hays was 15 of 26 for 140 yards and hit Jared Scott with a 12-yard touchdown pass in the first quarter, but was picked off twice. The Bengals (1-5, 1-3) managed just 89 yards on the ground.
Walker finished with 95 yards on 16 carries for Portland State (3-4, 2-2). Alexander was 17 of 29 for 179 yards.
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