Here's the screenshot from the article. Note the bulge between Bush's shoulder blades.
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. (...)
To watch the debate again, I ventured to the Web site of the most sober network I could think of: C-SPAN. And sure enough, at minute 23 on the video of the debate, you can clearly see the bulge between the president's shoulder blades. (...)
So what was it? Jacob McKenna, a spyware expert and the owner of the Spy Store, a high-tech surveillance shop in Spokane, Wash., looked at the Bush image on his computer monitor. "There's certainly something on his back, and it appears to be electronic," he said. McKenna said that, given its shape, the bulge could be the inductor portion of a two-way push-to-talk system. McKenna noted that such a system makes use of a tiny microchip-based earplug radio that is pushed way down into the ear canal, where it is virtually invisible. He also said a weak signal could be scrambled and be undetected by another broadcaster. (...)
Suggestions that Bush may have using this technique stem from a D-day event in France, when a CNN broadcast appeared to pick up -- and broadcast to surprised viewers -- the sound of another voice seemingly reading Bush his lines, after which Bush repeated them. Danny Schechter, who operates the news site MediaChannel.org, and who has been doing some investigating into the wired-Bush rumors himself, said the Bush campaign has been worried of late about others picking up their radio frequencies -- notably during the Republican Convention on the day of Bush's appearance. "They had a frequency specialist stop me and ask about the frequency of my camera," Schechter said. "The Democrats weren't doing that at their convention."
http://www.salon.com/news/feature/2004/10/08/bulge/index_np.html