Oliver Willis has made a startling discovery which has important scientific ramifications: The Hewitt Indicator:

How does one predict the future? There are many methods, some involving entrails and spells, others use crystal balls. My method is to predict the future by doing the exact opposite of what Hugh Hewitt says.

You can see the data at the link, which is pretty convincing. I have previously relied on Dick Morris as a similar indicator, but he has previously gotten things correct, which throws off my own prognostication. Hewitt seems like a better bet.