I like to analyze the demographic that watches certain shows based on the advertisements that play during the breaks. For example, I watch Headline News in the morning, and 90% of the commercials are for prescription medications and scooters for the elderly.
What commercials do they play during a show geared toward my generation? I haven't really paid attention, but I would guess that movie trailers and car commercials make up most of the ads.
And what about political commercials? As the election gets closer, I'll pay attention to the ads that play on different channels and at different times. Imagine this: McCain bobbing his head to "In Da Club" and talking about his plan for Iraq.