Someone on HN suggested that prediction markets would be interesting if only politicians were allowed to participate. For example, politician says that this bill will make the economy better (insert tangible metric here). Well Mr politician, put your money where your mouth is. If you indeed believe this is best for your constituents, bet on it, and if you're right, you'll reap the benefits of your legislation. If not, you're either incompetent or a liar; in either case, your people deserve to know.

Theres obvious issues with this system, but I thought it was a fun thought experiment.