The problem with your equation is: cold Yankees tend to migrate south, and have effectively pushed Virginia into the light blue column and have almost accomplished the same in Florida. Even though Obama more or less wrote off North Carolina in October, he only lost the Tar Heel State by a small margin. People from downstate New York, New Jersey, the New England states, Philadelphia, Delaware, and Maryland carry their liberalism south in their U-haul trailers. Ditto for Californians; they have ruined Colorado and Nevada politically, and to a lesser extent Washington and Oregon as well (although the coastal cities of these states were somewhat liberal even prior to the Californian influx).
One reason Texas and Oklahoma have not moved leftward is that the influx of Northern people has mostly come from the Midwest, rather than California and the Northeast. The suburban counties around Dallas, Houston, and Austin, places where the Midwesterners have migrated, voted for Romney by 2-1 margins.
Note to the chambers of commerce in the South Atlantic and Rocky Mountain states: encourage Midwesterners to migrate and discourage Northeasterners and Californians from doing so.
Ever seen a Yankee go through a Texas summer without AC?
It is truly one of life's great pleasures.
If they can't afford heat in the north they can't afford AC in the south.