Beyond the urban-rural split, are there other patterns showing up? I have for example been speculating in several threads that Obama might have done better with rural mainline protestants (Lutherans), especially on the female side, than with Catholics, as (at least in Europe) the former tend to have a more socially moderate / liberal attitude. Linked to that, there is the common assumption that Obama has been doing particularly well among people with Norwegian ancestry.
There is also quite some evidence across several states that Catholic German-Americans have swung strongly towards Romney, but I wonder whether the same holds true for Lutheran German-Americans.
Counties (even rural counties) are typically too mixed in terms of religion / ancestry to allow for conclusions, but villages / townships might have maintained a level of 'pureness' (I assume initial settlers clustered according to religion) to allow for a more detailed insight in such patterns.
Well, I have noticed that family household areas are becoming increasingly republican, while non-family household areas are becoming increasingly republican, but then again that relates to the Rural-Urban split again because more family households in suburban/rural areas and vise versa. But rural areas with more households are much more republican. Wonder why Western Wisconsin is so Democratic? It's because about only 55% of houses are families, rather than in the high 60's in places like Washington County.