When looking at these primary maps, its almost as if Obama/Clinton and Romney/Santorum look like the same urban/rural split.
It's not so much an urban/rural cleavage in the Republican primary so much as it is a suburban/rural divide. Santorum polled quite well in the big cities - he won Dayton and Toledo and came very close to beating Romney in Columbus. Income and religion are, I think, the two most relevant cleavages to explaining the divide.
really cool. I wonder if Ward and Trimble townships are especially libertarian. What's up with the one Gingrich precinct?
I think that's just an anomalous result in a part of the state in which Gingrich's achieved his best results - in the rural vicinity of Dayton. There's nothing particularly unusual about Perry Township (52 votes for Gingrich, 44 Santorum, 43 Romney, 13 Paul).