People have been talking about this for years, and I'm sure there's Real Research done, but I imagine that there is increasingly a giant generational divide between those who actually get a barrage of campaign ads on the teevee and radio and those who don't. It must be the case that younger people (and I don't mean kids, I mean people under 40 or so) are just much less likely to see/hear those ads, either passively or actively. I think a few years ago people were asserting this a bit prematurely, but it has to be the case now.
