No bias at all. Never been a Michigan fan, especially with a scumbag like Harbaugh cheating his way to a title. To be fair, not a Buckeye fan either. Just like you, I grew up with the “Big 2 and the Little 8” for 30 years.
The only time I root for either Michigan or Ohio State is when they play Notre Dame, Alabama, Texas, or Penn State. When Michigan and Ohio State play, I puke slightly less in my mouth when the Buckeyes win.
As far as bias goes, you are the last one to talk as your bias towards Michigan bleeds maize and gold