that's basically St. Croix and Pierce counties, which have a combined population of about 100k. Pierce voted for Kerry actually which I find kind of suprising since it was the only suburban Twin Cities county to do so, and areas that far away from the city proper are usually extremely Republican.
It will depent on the TV stations' demographics, but a lot of those ads might have aimed at WI. In 1980, for example, I knew a lot more about Jay Rockefeller than Arlen Spector, because Rockefeller had run for Governor of W VA. To run a TV campaign in norther WV he had to run the spots on Pittsburgh based TV stations. I see ads here for NJ and DE governors' races, because most voters in South Jersey and north DE watch Phila stations.