According to a former Edwards aide, such a tape actually exists.   After learning of the tape, the aide did what ever sensible America would do: kept quiet about it got a book deal.  

Hey John, if you're reading this and are thinking about releasing the tape, I've got some title ideas:

Debbie Does the Two Americas

Deep Throat; Deep Pockets

Presidential Cam-bang Bus

Rielle MILF Hunter

John Kerry was the Guy Filming

Also, John, I don't like being the "I told you so" guy, but I made the video below nearly two years ago: