Doug Karsch, the voice of Michigan football, has called only one loss in his two years behind the microphone — a setback to TCU in a national semifinal. He’s seen two Big Ten championships and a national championship and will be at it again this fall with color commentator Jon Jansen next to him. Karsch and Skene weighed in on the Michigan defense, the quarterback competition, and more in today’s podcast. Head coach Sherrone Moore told us a few weeks back that whoever is behind center, the mission is the same — complementary football that allows them to win, whether it’s by one point or 20. “W…