Someone correct me if this isn't accurate, but my research shows the 1992 Marshall Thundering Herd with a regular season record of 8-3 as the last unseeded national champion. If you look at that box score it looks like a crazy game with Marshall winning with a late field goal over YSU.

https://en.wikipedia.org/wiki/1992_N...son#Postseason

https://en.wikipedia.org/wiki/1992_N...mpionship_Game

Let's hope our Thundering Herd to do it again!! Go Bison!