There is a popular fan theory originating on Reddit thread covering this topic. I have always thought Jar Jar held a more substantial role in the Star Wars universe. His action to give Palpatine unlimited powers is too glaring to ignore. Either George Lucas was trolling us all and Jar Jar is nothing more than a 2D comic relief or he was setting us up for a deeper, subtler interpretation of Star Wars.
J.J. Abrams likes the theory:
“There was this unbelievably lengthy analysis, in a very seriously thought-out way, as to why it’s obviously true that he is [evil],” Abrams said. “That to me is remarkable.”
However, according to Stephen Witty interview, that's NOT the case in the film:
"Right, 'Jar Jar is really a Sith Lord,'" Abrams says with a grin. "I so wish I was smart enough to come up with that one. I'm not kidding. That was on Reddit, I think, and it's this very long and brilliant theory and I commend whoever wrote it – it's crazy well thought-out. And if you read it – well, it's a little like most conspiracy theories, where if they're well-written and well-considered, you start to get convinced."
OK, but on the record, can he confirm that Jar Jar is not a Sith Lord?
"He's not," Abrams says firmly. "As far as I know."
In addition, we know that J.J. Abrams is in tune with all the normal Star Wars fans and wants to kill off Jar-Jar, as he admitted to Vanity Fair :)
... At one point during the effects review, while watching a sequence with spaceships flying low over a desert planet, Abrams asked to pause the scene. With a light pen, he drew a little squiggle on a sand dune.
“I have a thought about putting Jar Jar Binks’s bones in the desert there,” he said.
Abrams laughed, too, but insisted, “I’m serious!” He pointed out that the shot zips by in a second, if that. “Only three people will notice,” he said, “but they’ll love it.”
And even further than that, if you need more proof, let's ignore the Jar-Jar part of the theory and concentrate on "Sith". As per Abrams, Snoke and Kylo are not Sith (though, that may be "true from a certain point of view" and Abrams simply being vague-ish to hide the fact that Snoke is Darth Plagueis).