@freemo
A few demographic factors that may affect this:
* Urban areas have a higher concentration of more educated people
* Urban areas have a higher concentration of non-white people
Education likely affects people's trust in religious leaders (or even awareness of them). Exposure to other ethnicities and cultures likely drives compassion for them.
My point is simply that one shouldn't interpret this as meaning that the blue sections are unfairly dominating the red sections. It may just as easily be interpreted as an uneducated and selfish group controlling the vast bulk of the territory.
@IAmErik I agree this shouldnt be used to suggest the blue sections are unfairly dominating the red... instead it simply means if you are almost anywhere in the USA, you are likely in a red area as very few places in america are blue.... In other words... there are no blue states on blue cities as the OP states.