Just noticed that Dave has uploaded town-level maps of the recent New Hampshire primaries. It’s worth comparing the results of the 2008 Democratic primary with those of the 2004 Democratic primary:

While there are certainly similar patterns in both maps (Dean and Obama both did well on the border with Vermont, Clinton and Kerry both did well on the border with Massachusetts), there are some significant differences. I would go so far as to say that the differences are significant enough to indicate that the social basis of support for the top two candidates in 2008 was, at least in part, quite different to the social basis of support for the top two candidates in 2004.