Image from Paleogeography and Geologic Evolution of North America.
New York Times 2008 Blue counties voted for Obama
Dave Tucker alerted me to this and apparently it is making the rounds so I am helping spread it as well. The original observation of southern voting patterns linked to the former Cretaceous shoreline was noted by Steven Dutch back in 2002 ( http://www.uwgb.edu/dutchs/Research/Elec2000/GeolElec2000.HTM). Craig McClain follows up (ttp://deepseanews.com/2012/06/how-presidential-elections-are-impacted-by-a-100-million-year-old-coastline/).