Personalized "form letters", emails, etc are a large part of the communication Congress receives and they IGNORE them for the most part.
http://www.rallycongress.com/signup/congressmessage/
Rally Congress ensures your online petitions have real impact by delivering your supporters' messages to their elected officials.
Rally Congress allows advocacy managers to create calls-to-action through an easy-to-use online control panel. These petitions, which are hosted by Rally Congress, have a customized look and feel to match your overall campaign.
Unlike most internet petitions, with Rally Congress your site visitors can edit suggested letter text and send messages to their entire Congressional delegation. For each petition signer, Rally Congress validates the incoming data, determines the signer's district and elected officials, and stores the information in a secure database. The site user will also receive a confirmation email with a copy of their letter.