This map is more instructive if you look at a small thumbnail, or look at a full-sized image (click the image for a larger view) from four or five feet away, than it is if you look at the full-sized image from normal viewing distance. Note the following:
- Clinton (green) won the Boston-Nashua-Manchester media markets in the Southeast corner of the state, except for Portsmouth and nearby surrounding areas.
- Obama (purple) won the rest of the state, except for the Northern-most reaches of the state where very few people live.
- Obama ran strongest in the college towns of Hanover, Keene, and Durham. He also won Portsmouth and Concord by smaller margins.
- Clinton won Manchester, Nashua, and the Boston exurbs by larger margins.
When combined with the exit polls, my read of the situation is that Obama formed the "Bill Bradley Plus Coalition": wealthy liberals, young voters, people of color, and as many middle class ($50,000-$100,000) voters as you can get. He came up a little bit short, primarily among working-class and middle-class urban voters, and didn't have enough people of color in New Hampshire to give him one last little boost.
Update: I filled in the towns that didn't report until this morning, and tweaked the colors a bit. The one yellow town was an Edwards win—I guess a mill closed there recently. The uncolored towns in the North Country are unpopulated and don't report any results. Ezra observes that neither Clinton nor Obama can really claim to have a big advantage among any one New Hampshire Demographic aside from Clinton's margin among women. True, but I still think it's notable that Obama's coalition starts from the wealthiest and well-educated and works down, while Clinton's coalition starts from the working class and works up. But the margins are very close. Both teams played hard!