The US is the single most important thing in most things. When it comes to global finance, this is largely true (China, India, Germany, Japan are important, but not on a par with the US although China may get pretty close pretty soon).
Ben Bernanke is up for re-election, and there are fears that lessons haven't been learnt, meaning the bubble that caused all our problems will be left un-addressed. That's bad, means the lessons have not been learnt and we'll be here again before long.
Still, that's the inevitable cycle of capitalism