I do not know if Rush made the announcement about Jeb! - but I am certain he knew of it prior to the Bush love fest soliloquy.
It has been news most of the day - and Rush hears these things way before it makes it out to the public.
This isn’t exactly something they would call him and brag (or whatever) about. They could have let him know.
Can’t he see what the represents to us?
He must. It’s a cataclysmic moment. He should know it.