This map shows the margins of the 2008 Democratic presidential primary for each Wisconsin county. Usually I do an analysis when I create these sorts of maps, but I'm kind of stumped. The county results show little correlation with past general election results, recent state primary results, media markets, or anything else I've previously looked at. The exit polls aren't much help either, nothing jumps out at me that could really explain the county patterns.
So I'm just going to throw this back to you all. Leave a comment if you have a theory, and if the time involved isn't too great I'll check it out and post the results. Maybe you'll see something obvious that I'm missing. Thanks!