Following up on my post yesterday on TextMap - here's a comparison of the heat maps of both Democratic candidates for the next Presidential Election in 2008.  According to Textmap, the definition of a heatmap is:

Heatmap: shows the relative interest in an entity at every locale in the United States. We have developed a geographic model of news influence which enables us to gauge the relative amount of exposure a given entity has received as a function of location.

The heatmaps are actually more relevant because they tell me where Obama is stronger than Hillary and vice versa.  California, Iowa, Michigan, Wisconsin are moving more towards Obama than Hillary Clinton and that's information that a politician can use even now - but it will get a lot more relevant as the elections loom closer.

I'll cover a little more of what you can do with TextMap on Friday.