Well I just played around with it, but here's my feedback as someone outside of chicago:

1) You need a simple front page, "Live outside Chicago? Signup here to be notified when we add more regions!"

2) The functionality and mapping looks real good, but is really something users are looking for when looking up representatives? It seems to sort of clog and confuse the UI being there on the right. I'd probably move them below the fold or at the bottom of the page and instead put anchor links or further info links on the right.

3) RSS - awesome. Email alerts - awesome. Perhaps add the email alert form on the page itself instead of require an additional page view.

4) Need a more clear link to the front page, the logo at the top I'm more apt to click on is the one for Windy Citizen rather than RepSheet.

Overall a nice clean app that I'll use once you expand to cover my geo area.