Manipulation of the Tradesports political markets

Glenn has a follow up to the question raised after the third debate, with links to Don Luskin who dug into the trading info and found indeed a large movement trader who was manipulating the price.

Does this make Tradesports less useful? I'm certainly taking their general "Bush elected/Kerry elected" contract movements a lot less seriously. But, I think my analysis on the electoral college contracts still holds. But we'll have to see.