Minnesota Gov. Tim Walz has held a number of other jobs, from member of Congress to Army National Guardsman to agricultural worker to teacher. But at her first joint rally at Temple University in Philadelphia with her newly chosen running mate, Vice President Kamala Harris focused on another of his roles: that of a high school football coach. “Tim was the linebackers’ coach for the football team where, I’ve heard the stories about, he had a knack for using the game of football to teach life lessons,” said Harris. “He saw the potential in kids who sometimes didn’t even see it in themselves. Und…