If I could fund an account, I would bet on Romney for sure. This is easy money.
The non-U.S. betters have no clue.
All you have to do is sign up and send them a check and proof of identity. But it takes a while for your account to become active. So you have definately missed out on this election oportunity.
The amount of money that it would take to manipulate Intrade is less than what it would cost for normal advertising. So I don’t have any real confidence in its predictive value for a presidential election.