I was only ten years-old at the time, but I remember the flap that arose before the debate between Jimmy Carter and Ronald Reagan. Someone inside Carter’s camp stole his briefing book and handed it over it to the Reagan campaign. It turns out that it was a Kennedy guy, as is revealed in a new book on the Reagan campaign. I knew there was some serious acrimony between Carter and Kennedy’s people, but I hadn’t considered that it would be deep enough to cause open sabotage.
President Carter is still said to be deeply upset about the incident and is quoted saying, “I don’t think there’s any doubt that it made some difference.”
I bet he is even more pissed now.
Update [2009-10-15 16:48:37 by BooMan]: Now there is more confirmation.