Four years ago, watching the Bush v. Gore debate, I noticed Bush pause with that deer-in-the-headlights look of his. I was struck by how much he looked like someone listening to something else...like a prompter. I speculated uncharitably that Bush had been implanted with a device that allowed his handlers to tell him what to say, and his bizarre pauses were caused by malfunctions or slowdowns in the transmission.
Apparently, it's true, though he wears the device rather than has it implanted. Read this sobering story in Salon. If you don't need as balanced a report, check out the site isbushwired.com which includes gossip, speculation, and reports of broadcast equipment at Bush appearances accidentally picking up a channel with a prompter's voice (a different voice, saying many of the words of the speech) during Bush's speeches.
It's only a matter of time before someone figures out a way to hack Bush's prompting channel while he's mid-rant--even just a nice blast of loud noise would be delightful to watch.