The truth is that when you read a publication such as the World Almanac they don't list the winner of DI-AA championship game as the national champion for football. The team that they list is a DI-A team, such as Florida, USC, LSU .... There is no mention of the DI-AA championship game or a list of past DI-AA champions. There is a list of past college hockey champions and North Dakota is in there seven times. I reference the World Almanac because I happen to have one in my house and it comes in handy for silly arguments like this.
I live in the south and you could ask most folks to list 5 DI-AA teams and they couldn't do it. When you talk about college football down here it is all about DI-A football. Before you ask the question about how many know anything about college hockey, I will say very few. That being said, hockey as a whole is gaining popularity in the south, mostly due to the ECHL.