If the market rallied on Inaugeration Day, and the Obamites were able to point to this rally as an indicator that Wall Street backed The One, this would grease the skids and make it easier for the Democrats to pass their anti-business, anti-wealth agenda. Such a rally would have been paid for, in spades, down the road.
If the markets are going to react negatively to Obamanomics, it is best to know this early and as clearly as possible. That way, the worst excesses might be avoided.