See article to right, Bruce Ivins was a Democrat
Also it appears he is right-handed. I'm no expert by any means, but the way the printing slants on that one envelope we've seen so much, it possibly could have been a left-handed person who wrote it, may mean nothing at all.
Left-handed writer’s writing slants upward, unlike the writing on the anthrax letters. That is, if it slants at all.