If you could only beat 4 teams year-in year-out... who's the Fourth?
Considering almost everyone on this board would rate OSU, MSU, and ND as their #1-#3 rival (in no particular order as to not ignite another who is or should be UM's biggest rival debate)... who is your #4 biggest rival? Why?
I assume geography will decide most answers, or maybe personal experiences (a terrible loss that still haunts, or a terrible roomate who can't stop bragging about Purdue's Big 10 championship with Drew Brees, etc.)
My answer: given I live and work in Chicago surrounded by Illini turn into huge football fans once every 10 years after they beat us... and because I can't stand my brother-in-law who lies about where he graduated (flunked out of Illinois - claims he's alum)... the Illini are my no. 4 most hated rival