Jed Kolko connects cities’ housing costs to the politics of their residents:

Looking across all 100 largest metros, the correlation between price-per-square-foot and 2012 vote margin was positive, high (0.63), and statistically significant. In fact, the only expensive red market was Orange County, CA, at $363 per square foot. There was a huge drop-off to the next-most-expensive red market—North Port-Bradenton-Sarasota, FL, at $150 per square foot.

Derek Thompson isn’t surprised:

There is a deep literature trying liberal residents to illiberal housing policies that create affordability crunches for the middle class. In 2010, UCLA economist Matthew Kahn published a study of California cities, which found that liberal metros issued fewer new housing permits. The correlation held over time: As California cities became more liberal, he said, they built fewer homes.