He thinks that protestors will hack into his wireless pacemaker, pretty unrealistic, but he's probably considered assassinating others using the same technique, that's why he assumes someone would do that to him
Cheney had wireless heart device disabled as terror precaution
http://www.thestar.com/news/world/20...recaution.html
"Former U.S. vice-president Dick Cheney once feared terrorists could use his heart defibrillator to kill him and had his doctor disable its wireless function."