I'm not sure Dobson did anything more than send a private e-mail to a group of friends with his candid opinion of Thompson. He may not have intended for it to be leaked. Regardless, it is not anywhere near as powerful as if he put it out on radio or personal e-mails to large groups etc, his communications that reach the people that aren't political junkies.
‘He may not have intended for it to be leaked.’
Based on what I’ve seen from him, I seriously doubt he didn’t mean for it to become public.
Just my opinion.