Some people can say anything and still get promoted.
Ben Bernanke is one of those people who can say one thing one day, and then two or three years later, after reality totally discredits that position, no one seems to remember that he said it.
These are the same folks who can manage to get appointed to high positions by presidents of both parties--again, no matter who wins, they come out on top.
Case in point: In 2005 Bernanke said there was no housing bubble. Then two years later the housing market collapsed. And yet he's still serving as fed chair under a different president.