From our ABCNews Blog:
We have a new tool at Hitwise that allows us to take the demographics and psychographics of visitors to a website and then, based on the segmentation of visitors to that site across basic demographics (gender, age, income, region) and Mosaic types (50 types based on behavioral activity) and find the best match for other sites by category.

I ran an experiment this morning using the official campaign sites for Barack Obama and John McCain, here are the results. While not all Linkin Park fans are Barack Obama supporters, or Yankee fans McCain supporters, this simple analysis tells us those sites that best match the composition of visitors by industry category.
As we get closer to November, I’ll continue to build online personas based on demographic match for each candidates site visitor. Stay tuned.