A press conference in June 5, 2004 televised on Fox News with Bush and Chirac seems to reveal someone saying what Bush is about to say before Bush says it. The video clip was available last night on www.isbushwired.com, but that site is down because of excessive use (or perhaps a DOS attack?).
I downloaded the video last night and viewed it, but can't upload it because it's 16 Meg.
First, it could be entirely doctored--I don't know. I didn't see the original event on Fox News.
Second, it could be that there was some other technical glitch that only makes it appear that Bush is being fed lines.
But there is another explanation: Because the event was being simultaneously translated, the press camera received a wireless input--but it received a transmission that happened to be on the same channel as the translation service. (The voice is not the translator's, by the way, because no translator would translate English-to-English.)
So you can judge for yourself, I'll make it available for peer-to-peer file sharing; search for "Bush Chirac Wired."
By the way, I don't know whether Bush was wired in the debates, but we certainly need a better explanation than (1) the video of the event was doctored, an assertion which even the White House now retracts; or (2) it was a rectangular "rumpling of that portion of his suit jacket."