Also, don't listen to all these feature requests and get scope creep. The only additional thing I'd love to see is even more granular levels of officials, but I know how difficult/nonexistent the data is there.
epoch_100: Stick to making an awesome data source and interface to solve the one problem you've picked :)
In the UK mySociety does similar things, their WriteToThem services gives a drill-down on the politicians for a given postcode. You'd probably be really interested in their http://www.everypolitician.org/ project, which is trying to do this for the entire planet -- but generally working from the top down.
I'm involved with https://democracyclub.org.uk/, which works particularly on developing really good election data. epoch_100, reach out to one of us if you want to chat :)
Thanks for the interest!