Matthew Holian and I will soon release a new Working Paper that examines how center city residents and suburban residents differ with respect to their preferences over government regulation focused on transportation policy (think of gas taxes and bullet trains). We recognize that center city residents and suburbanites are not clones. The graph below (based on California data from the year 2000) highlights that conditional that you live between 0 and 5 miles from a California center city downtown, your probability of being a registered Democrat is over 50% while your probability of being a registered Republican is roughly 25%. These numbers do not add up to 100% because there are many other parties and many voters who do not register with a party.
Note the monotonic patterns for both groups up to 35 miles from the CBD! The median voter is likely to live in the 15 to 30 mile range. What transportation policies does she want? When Democrats live in the suburbs, do they demand the same policies as their Republican neighbors? When Republicans live downtown, do they demand the same policies as their Democrat neighbors?