By John Borton Michigan football hasn’t spent a lot of time being mediocre to poor over the past 145 years. You don’t accumulate the most victories in college football history without consistent excellence. There are always dips, though, through change and circumstance. This is one of them. RelatedTE Hogan HansenTyler Morris on O-woes Michigan and Michigan State both enter their Saturday Showdown at The Big House with 4-3 records. Here’s the difference. MSU fans feel giddy about that mark, following a 4-8 record last year and losing records in three of the past four. Michigan followers linger …