Kevin D. Williamson‘s latest National Review Online column looks beyond the politics of the debt-limit debate to examine who would suffer if the federal government’s credit rating takes a hit. In addition to banks and insurance companies, Williamson identifies some other losers:

State and local governments are holding another $1 trillion or so in Treasuries, meaning that the credit profile of our already struggling states and cities would have about as much credibility as Dominique Strauss-Kahn’s wedding vows. A lot of that pension-fund exposure to Treasury debt is for state and local government retirees, too, so Austin and Sacramento and Boise and Augusta will be right between the hammer and the anvil, getting pounded. And so will Springfield — the Typhoid Mary of fiscal contagion at the state level. As I’ve written before, I suspect that Illinois will be the first state to go into something like a full-blown insolvency, largely due to its unfunded pension liabilities. Just Monday, Ben Bernanke confessed himself worried about the situation in Illinois and California. And if I may be forgiven for repeating myself: Most states have either statutory or constitutional obligations to pay those pensions, so they cannot just reduce them or walk away. There’s really no such thing as a state-bankruptcy law, so nobody knows how a default would unfold. How’s that for uncertainty in the markets?

Williamson offers this closing thought:

The thing that has not been sufficiently understood, I think, is this: The United States is not on a downgrade watch because the markets fear we won’t raise the debt ceiling in time to avoid a default; the United States is on a downgrade watch because the markets believe the debt-ceiling debate presents the last real opportunity for the government to enact a meaningful fiscal-reform program before it is well and truly too late to avoid a national crisis. The credit agencies, wisely or not, aren’t worried about the short-term political fight leading to an immediate default, but about the near- to medium-term fiscal situation, which is plainly unsustainable.