Are any of the presidential candidates members of skull and bones? or Freemasons?

I have always been fascinated with the idea that our countries leaders are a member of a secret society. The last election it seemed like I heard much more about Bush and Kerry being members of skull and bones. I havent heard anything about Obama or McCain? Or could it be possible for Hillary Clinton to be involved with any of these societies. I guess Im asking "do any of the current candiates have an upper hand which we cannot directly see, such as secret societies or fraternities?"