A more "market" type comment...
The markets hate uncertainty. We now have a 2 year budget even though we think it stinks, it denotes Fiscal Normalcy ( of sorts ). Now Helicopter Ben denotes slight tapering, which could be construed as Monetary Normalizing. The 2 are the exogenous forces that could effect their ability to do business. These are at least on the surface, minimized.
With that said the drinks will flow, to you and I it is a form of insanity with all the other exogenous factors, but to them it is now party on...
However, you just pointed out why it is not so insane (normalizing, etc.)
I have seen how over the last 5 years when Obama fails Wall Street rejoices. This happened with the failure of cap and trade, extension of Bush tax cuts, failure to close Guantanamo, even gun control...and now Obamacare.
Makes sense to me.