Take your mind off the election for a minute and consider something truly depressing. A site called Flowing Data has a map that shows the gradual spread of Wal-Mart stores across the country. The animation begins slowly in 1964, but by the time it reaches the late ’80s and early ’90s … well, let’s just say that after you watch this, you’ll understand why John Zogby includes a “Do you shop at Wal-Mart” question in each of his surveys.