The claim is that S&P is directly manipulating the current US debt crisis to avoid having to pay the piper for the 2008 US mortgage market collapse:
Whatever S&P’s agenda, it has nothing to do with avoiding default risks or putting the US on sound fiscal footing. It appears to be intertwined with their attempts to absolve themselves from responsibility for their role in the 2008 financial crisis, and they are willing to manipulate not only the 2012 election but the world economy to escape the SEC’s attempts to regulate them.
This website is highly partisan to the left (they were founded as a news outlet to keep the Valerie Plame case active, and I'm a member). But this claim seems a bit... extreme. Is there any evidence or supporting claim to this assertion that can be found elsewhere?