Yeah, lots of people followed ND who lived in areas with no major college team. NYC and Boston used to be filled with ND fans. Take into account the predominance of Catholicism in those areas, and you have a fan base. I grew in a mostly Italian neighborhood far away from South Bend, and everyone had Fightin’ Irish apparel.
Yeah, I’ve known a few old timers who viewed ND as the “clean cut” guys. I never understood how anyone who went to Catholic school themselves could view them as the “clean cut” ones though (I joke with much truth).