take a look at this site:
http://www.citistates.com/whatis.html
"according to figures compiled by Standard & Poor’s DRI division for the US Conference of Mayors and National Association of Counties, the US’s 314 metro regions are clearly the economic drivers, providing 84 percent of new jobs, 95 percent of high-tech jobs, 88 percent of the country's income."
Seems like there will be a big problem one day if the centers of economic growth always vote different than the rest of of the nation.
That problem exists now.
The answer is to free our urban centers from the death grip of government and government dependence once and for all.
While the cities vote democratic, it's the republican voters that live in the suburbs and surrounding counties that drive that economic engine in most cases.