Looking at various political issues
through the lens of rural versus urban
may be very revealing.
Evidence for an rural/urban split
"Political parties now rooted in two different Americas", American-Statesmen staff, 18 Sep 2004
Evidence that suburban areas lean towards a party
MCKEE, S. C. and SHAW, D. R. (2003), Suburban Voting in Presidential Elections. Presidential Studies Quarterly, 33: 125–144.
"Jimmy Carter’s share of the suburban vote dropping from 53 percent in 1976 to 37 percent in 1980"