The Michigan secondary's struggles the past few weeks have been obvious.
Allowing 645 passing yards to Michigan State and Minnesota changed the perception of U-M's defensive backfield.
"As great as the goal-line stand was (against Minnesota) -- that was a high point -- there were some other points in that football game where the meeting wasn't as pleasant," Harbaugh said today on WXYT-FM (97.1).
According to Harbaugh, the secondary wasn't being tested enough in practice to be prepared for Saturdays.
"Watch the tape; it's an understanding of everybody on the team contributing to make improvements," Harbaugh said.