This is what I'm talking about -- 2004 Election by county:
Even in 2008 the county map looks like a Republican landslide:
I don't agree with your breakdown of America- there's a little bit too much broadbrushing there. But I do agree with your statement above. This nation is too linked to seriously think about carving off certain parts. Even the most liberal and conservative states have political minorities from the other side of the spectrum that comprise 40% of their population. In 2008 , in one of the worst years for Republicans in recent history, John McCain got 38% of the vote in California.
The idea that the country could ever be carved up into liberal and conservative bastions ignores reality.
This is what I'm talking about -- 2004 Election by county:
Even in 2008 the county map looks like a Republican landslide: