Time will tell, but Krugman sees something:

So why the sudden ubiquity of deficit scare stories? It isn’t being driven by any actual news. It has been obvious for at least a year that the U.S. government would face an extended period of large deficits, and projections of those deficits haven’t changed much since last summer. Yet the drumbeat of dire fiscal warnings has grown vastly louder.

To me — and I’m not alone in this — the sudden outbreak of deficit hysteria brings back memories of the groupthink that took hold during the run-up to the Iraq war.

And we all know how well that turned out.

I'm partial to Fiore's take on this, actually.