"In the final days of this captivating presidential election season, are you interested in knowing how US has voted in the past? Together with the Digital Scholarship Lab at University of Richmond, the Google Earth team has mapped historical election results in Google Earth and Google Maps. These maps show how the population has voted in past presidential elections from 1980 through 2004, and include election results at both the state and county levels. The maps also include demographic information derived from the 1980, 1990, and 2000 US Census."

http://google-latlong.blogspot.com/2008/10/how-us-has-voted-since-1980.html