Joe is going off the deep end. Market noises are now interpreted as the intergalactic battle between the pro-HCR and the anti-HCR, who are both seeking to manipulate the InTrade prediction markets. No evidence whatsoever is displayed.
P.S: I am not picking on Joe, who is a good web curator, and a nice chap. Just disagree with him (and Andrew Golberg) that prediction market journalism is easy to do. Good prediction market journalism is very hard to do. Requires scoops and pertinent analysis. Scrapping exchange probabilities and aggregating it with re-written news is not enough.
More info on health care reform on Memeorandum.