A change at quarterback resulted in a change in trajectory for the Iowa football team on Saturday afternoon. Cade McNamara left the game in the first half after an interception with Iowa trailing 7-5. Enter Brendan Sullivan and the Iowa offense finds it’s footing on the way to a convincing 40-14 win over Northwestern at homecoming in Iowa City. Sullivan didn’t start great on offense, going three and out and his first three drives under center. But, on the fourth drive just before halftime on a two minute drill, Sullivan used his legs for a first down run and then on third and one from the 26 y…