I think, in at least the hockey world, UND is a major player. Founding member of the WCHA, !-1/2 hand full of rings, and history second to none. USCHO is still for hockey junkies and it didn't surprise me at all to see so much love for UND. Not intended to take anything away, you're just dealing with a knowlegdable puck fun (on average ) on USCHO.
Do a similar poll on a bouncy ball site - or even ESPN front page - and you'd see the obvious choices of the Big Ten and other schools with DI BB or FB presence.