I am a Duncan Hunter supporter and I think this is a great response.
My problem is that I cannot find the letter at the official campaign website: http://gohunter08.com/
When I email items, such as this letter, to friends I usually provide a link to the source to prove authenticity.
You are correct, it never made it up to the site. It was sent out to us in email (the same way all the press releases are sent out) and due to a few technical site issues, the webmaster didn’t get it posted.