The Google Earth 2006 election resource tool indicates the country’s 436 congressional districts with stars on the popular 3D map of the country. Clicking on a star pops open a bubble window that has information on the candidates in that race.
The tool will also include links to news, images and search results on candidates, as well as a bunch of other stuff.
The “Register to Vote” layer added a short while ago has been changed to the “2006 US Election Guide” and includes two sub-layers: “US Election Guide” (click on the placemarks for useful voting information), and “US Congressional Districts” (which shows the borders of those districts). These layers are NOT turned on by default, but the information is more useful.