I like the idea, but I think these should be posted as models rather than something that people should edit before sending. It's important that letters are written with what the individual sender wants to say, and in their own words. That being said, I'll write something and post it later.
If anyone wants to write a letter to a senator/representative/governor, I'd be happy to help by editing or critiquing the letter. (I can't promise to reply right away during the build period, but I'll do it as soon as I can.) My email address is
z@dawgma.org.