He has to be, like when in episode two he walks up to the elevator where Obi-wan and Anakin are in wait for the door to open, then he "Acts Surprised" he obviously sensed them coming. and he was the one to declare more powers to Chancellor Palpatine so he could over through the Jedi, something in Jar Jar's best interest,(if he was a Sith Lord) He just needs another face in front of his agenda, you thought it was Palpatine, Naaaah its REALLY Jar Jar Binks. Watch the video in the link below it take a better look at this theory, and it makes more sense then I'm making.