In summary: backwood hillbillies vs. smart people.Politics in America is the big city Democrats aligned against the rest of the country.
Mitt Romney carried 228 congressional districts and Obama carried only 207.
Blacks, Hispanics and gentry liberals tend to live in densely populated urban areas that are hugely Democratic. You see the same effect on a smaller scale in university towns.
Republican voters are scarce in these areas but more evenly spread around in the rest of the country. You can find many 80 percent Democratic congressional districts. You'll have a hard time finding an 80 percent Republican one.
Texas will soon turn blue.