Q: What’s the difference between a monoline insurer and a prostitution ring?
A: One looks to the NY Governor’s office for a capital infusion; the other provides insurance.
or maybe
A: One goes down with Spitzer; the other goes down on Spitzer.
Feel free to send me your ideas.
A: One is supposed to keep bond problems from coming to a head, the other is supposed to give it.
or
A: One earns money by preventing the customer from being screwed, the other makes money for the opposite. (Oh wait, it looks like I reversed those, or did I?)