Theres nothing secret about the Bush families oil contracts in the Middle East and it would be strange if they did not share some contracts with the bin Laden family. They are, after all, extremely wealthy and have diverse holdings all over the world.
Although I don't know for sure, I would imagine the Gore family has tobacco deals in some pretty strange places.
And who knows where Bill and Hilary have their money invested. I'll bet it's not in real estate though.

troll