http://www.washingtonpost.com/blogs/...u-should-live/
The "tool" is about 2/3 of the way down. I was actually quite surprised that it nailed down my actual zip code on the 2nd time when I chose to omit the last question. (The first time it gave me some zip code way out in the boonies halfway between Denver and Kansas.)

Click image for larger version. 

Name:	ideology.JPG 
Views:	49 
Size:	52.5 KB 
ID:	46113