Now the food gets grown, the oil gets pumped and stuff gets done in the red areas between the blue towers. Honda builds cars in Marysville, Ohio Greensburg Indiana and Lincoln Alabama; Toyota in Huntsville, Alabama; Georgetown, Kentucky; Princeton, Indiana; San Antonio, Texas; and Blue Springs, Mississippi. Not big cities. The earth could open up and swallow cities like Camden, New Jersey and nobody would be the wiser.
Now that you mentioned it....most of the blue areas are the areas that will be lost to the ocean if there's ever a major quake or predicted pole shift. The melting ice caps would flood the blue states.
I suppose that's why it's called "The great cleansing of evil" or "He will destroy those people and those things that are destroying the earth."