Jeffmd and I have started working with Dave to bring election data to Dave’s Redistricting App. In the meantime, some folks (like Nico, doing Arizona) have delved into precinct-level data to add all-important political information to their redistricting projects.
Some states make this information readily available; others force you to collect it county-by-county. Below is a list of states which have complete statewide precinct files (graciously hosted by another Dave – Dave Leip of the indispensable Atlas of U.S. Presidential Elections):
And, as always, you can find precinct data (that isn’t otherwise available on the web) for a whole bunch of individual counties at SSP’s Document Collection on Scribd. Hope you find these helpful!