i like this theory...

Oct. 8, 2004 Was President Bush literally channeling Karl Rove in his first debate with John Kerry? That's the latest rumor flooding the Internet, unleashed last week in the wake of an image caught by a television camera during the Miami debate. The image shows a large solid object between Bush's shoulder blades as he leans over the lectern and faces moderator Jim Lehrer.
The president is not known to wear a back brace, and it's safe to say he wasn't packing. So was the bulge under his well-tailored jacket a hidden receiver, picking up transmissions from someone offstage feeding the president answers through a hidden earpiece? Did the device explain why the normally ramrod-straight president seemed hunched over during much of the debate?

also here's a site dedicated to this theory: http://www.isbushwired.com/