Bernanke is one of the people responsible for the current crisis. As a member of the FOMC that approved injudicious interest rate lowering under Greenspan, he is jointly responsible for the property bubble which formed. I have argued that point here.
Bernanke has reacted to the crisis badly. First he didn't admit that there was a crisis and then, when the crisis was underway, argued that it was "contained". Again, look at the link above for the details.
Once he realised that things were bad, Bernanke, a student of the Great Depression, acted swiftly in increasing the money supply at a time when the money supply was tightening into deflation. This was not a terribly hard thing to do. Even I could've done it. In fact, since I was actually aware of the crisis years before Bernanke, I would've been able to take pre-emptory actions and done a better job. Yet it's Bernanke who gets the multi-million dollar salary while myself and others bang our heads against the wall in response to the stupidity of those who control vast sums of money.
So the question is - why did Obama not know this? Is he being shielded from reality by a bubble in a similar way that Bush was? Or maybe he has no idea of how economics works and thinks Ben has done a good job. Or maybe Obama is simply having his strings pulled by industry insiders. Whichever one it is is hardly encouraging.