You know, with as many ads there are floating around on the streets for the celtics, I have never seen one tv ad for the team. Kind of strange.
Denver does have a decent hockey following, but I don't see them as belonging on the same list as the other markets mentioned before (I'm not sold on Pittsburgh either, but they obviously matter as of this moment). The Dakotas are essentially an offshoot of the Minnesota market. Wisconsin is fine, but like Denver, they don't quite measure up to the other markets. They might fall in as an offshoot of the Minnesota hockey market as well.
I really see it as two main american markets, the northeast and the upper midwest. Buffalo might as well be the midpoint between the two, but then we also have the heavy southern Ontario influence.