check it out (Score 2, Informative)

The University of Richmond has recently created an interactive database with maps of voting in previous elections. You can look as far back as 1884 and you can break down the maps by state, county, ethnicity, margin of victory, etc. The website is http://americanpast.richmond.edu/voting/ if you want to check it out. They are still working to expand it and add information such as immigration patterns and voting stats for women. It takes a huge amount of memory so it can be a little slow to load. It's a great resource though!