I have met many people in my day that are UM alumni with graduate degrees from elsewhere... when push comes to shove they are UM fans through and through.
I have met many people that grew up out-of-state (or even State fans) and root for their local college team, but then attended UM and are now UM 1st - local team 2nd.
For the first time I have met an actual UM alumni who is an outright traitor.
My former friend, Jack, grew up in Lincoln to a father who is a Nebraska alumni. Huge Cornhusker fan. He went to UM and during the infamous Alamo Bowl he pulled for UM.
But now, in the aftermath of Nebraska to the Big 10, he has declared that he will be wearing Red in the Big House the first chance he gets.
Any other stories of people turning their back on UM in favor of a rival/opponent?