Geithner Downgrades His Credibility to Junk

``"Is there a risk that the United States could lose its AAA credit rating? Yes or no?" Geithner's response: "No risk of that..." The mystery is why Geithner would say such a thing. What's he going to do if S&P or some other rating company winds up disagreeing with him? Send Barney Frank to beat them up? The problem for leaders who make indefensible claims like this one is that, after a while, nobody knows whether to believe anything they say.''