Can anyone explain why Hillary's numbers keep inching up in the Intrade predictions?  I know this isn't a scientific survey, and frankly, it isn't important, but it's bugging me.

Are Clinton folks deliberately going and buying to edge her up?  Is there any other rational explanation?

Surely one of you numbers wonks out there can explain this to me.

And while you are at it, also explain why the numbers add up to more that 100 (off by more than a rounding error, which was my first thought).

Thanks.