It's also possible that everyone had already expected that so it was already discounted into stock prices. - Morton Fox

That may be so, but you would have never known it from listening to the news pre-decision. In retrospect, it almost seems like deliberate misinformation. Then again, there was a transient uptick in hospital and health care-related stock. - Victor Ganata

Law doesn't matter as much as regulations by HHS. The meat is in the details of how PPACA going to be enforced - WarLord