http://www.intrade.com/ is a prediction market that lets you bet on political and economic outcomes. For example, the current odds on a “public option” for healthcare passing is 32.8%, and you can bet for or against with those odds.
It would be very easy for a connected individual, say, a congressional aide, to have some insider knowledge that other traders will not - for example that Congressman Blowhard is going to go all-out to get a public option passed, however watered down. The aide then borrows ton of cash and bets “FOR,” and racks in the winnings.
Now if this was a stock market we’d call it insider trading and throw the aide in jail. But I would think that prediction markets are new enough that there isn’t the same level of regulation, as no actual corporations are being traded. Is there a blanket ban that might cover this sort of activity, or is it open season for the Beltway clique to clean up with Intrade?
Intrade is based in Ireland, so even if you were openly cheating they wouldn’t be able to do anything about it, and the US authorities would have no jurisdiction.
Insider trading laws would not apply in any case because there is no stock, security or commodity trading taking place. Any relevant law would be that pertaining to gambling.