Grading Michigan football in all facets of a 27-24 win over USC. The U-M offense got enough from the running game and an outstanding first half defensive performance to overcome the absence of a passing game and pull out a huge victory. The grades: RELATED: Michigan 27, USC 24: Notes, quotes, and observations on a season saver Michigan rushing offense: AUSC coach Lincoln Riley lamented the big plays and insisted his defense won 80 to 85 percent of the snaps. That sounds a lot like what Ryan Day said after Donovan Edwards and Co. torched him a few years ago in Columbus. 290 yards is 290 yards, …