Rush Limbaugh and the other right-wing assclowns get their talking points from the RNC every week, from there it is just a matter of (almost instantaneous) dissemination to the "dittoheads" and posting on internet boards.
It is the right-wing's genius in getting their message out in the world, and I mean this with all seriousness and grudging respect. Their message is anything but brilliant, but the spreading of it is for sure.