Reggie Bush added a one-yard touchdown to put the Saints up 20-7.
Michigan scored the only points of the overtime period on a one-yard touchdown run by Gardner.
The only points of the game came on a pair of one-yard touchdown runs in the first half.
Michigan took the opening drive 80 yards in 13 plays, ending with a one-yard touchdown run by Howard on fourth down.
He also had one catch for a one-yard touchdown.
Mike Anderson then ran for another one-yard touchdown on the next play to increase Denver's lead, 17-6.
Mike Anderson then ran for another one-yard touchdown on the next play to make it 17-6.
The high point was a 10-9 win over California on a one-yard touchdown run by James Field with less than four minutes left.
Calac then ran for a one-yard touchdown in the third quarter to seal the 21-0 win.
In 2006 Kobel rushed one time, for a one-yard touchdown.