The south is kind of jacked up because most of those "fans" are actually "college first" types.
fans down here cannot agree on which College team to root for and it gets REALLY ugly like wearing another teams jersey in Philadelphia. However they all rally behind the Saints 100%.
Its a beautiful thing. however, SEC football is probably the closest thing to pro-football in the college ranks, so naturally there would be a lot of fans down here. Also, what else is there to do in Wisconsin except watch the Packers?