Congressional Republicans appear to be quietly but methodically executing a plan that would a) avoid a federal bailout of spendthrift states and b) cripple public employee unions by pushing cash-strapped states such as California and Illinois to declare bankruptcy. This may be the biggest political battle in Washington, my Capitol Hill sources tell me, of 2011.

That’s why the most intriguing aspect of President Barack Obama’s tax deal with Republicans is what the compromise fails to include — a provision to continue the Build America Bonds program. BABs now account for more than 20 percent of new debt sold by states and local governments thanks to a federal rebate equal to 35 percent of interest costs on the bonds. The subsidy program ends on Dec. 31. And my Reuters colleagues report that a GOP congressional aide said Republicans “have a very firm line on BABS — we are not going to allow them to be included.”

In short, the lack of a BAB program would make it harder for states to borrow to cover a $140 billion budgetary shortfall next year, as estimated by the Center for Budget and Policy Priorities. The long-term numbers are even scarier. Estimates of states’ unfunded liabilities to pay for retiree benefits range from $750 billion to more than $3 trillion.

Republicans in the House of Representatives already want to stop state and local governments from issuing tax-exempt bonds unless they are more forthright about these future obligations. Republican Representatives Devin Nunes and Darrell Issa of California and Paul Ryan of Wisconsin have introduced a bill that would require state and local governments to estimate the size of public pension liabilities if their assets earned a more conservative rate of return than many plans currently expect. Failure to do so would result in the suspension of their ability to issue tax-exempt bonds

Greater transparency on these obligations can’t be bad. In fact, the federal government itself would do well to report deficit numbers not just on the current cash-in, cash-out basis but also incorporating the underfunding of promised pension and healthcare benefits to retirees.

But it’s about more than just openness. Some Republicans hope the shock of the newly revealed debt totals will grease the way towards explicitly permitting states to declare bankruptcy. Indeed, legislation amending federal bankruptcy law is currently being prepared by congressional Republicans. Local municipalities do declare bankruptcy from time to time, most famously California’s Orange County in 1994. But states can’t. Allowing them the same ability to renegotiate obligations could enable them to slash public employees’ lavish benefits, a big factor in their financial woes. In a recent issue of the The Weekly Standard, bankruptcy expert David Skeel of the University of Pennsylvania walks through the implications:

With liquidation off the table, the effectiveness of state bankruptcy would depend a great deal on the state’s willingness to play hardball with its creditors. The principal candidates for restructuring in states like California or Illinois are the state’s bonds and its contracts with public employees. Ideally, bondholders would vote to approve a restructuring. But if they dug in their heels and resisted proposals to restructure their debt, a bankruptcy chapter for states should allow (as municipal bankruptcy already does) for a proposal to be “crammed down” over their objections under certain circumstances. This eliminates the hold-out problem—the refusal of a minority of bondholders to agree to the terms of a restructuring—that can foil efforts to restructure outside of bankruptcy. The bankruptcy law should give debtor states even more power to rewrite union contracts, if the court approves. Interestingly, it is easier to renegotiate a burdensome union contract in municipal bankruptcy than in a corporate bankruptcy. Vallejo has used this power in its bankruptcy case, which was filed in 2008. It is possible that a state could even renegotiate existing pension benefits in bankruptcy, although this is much less clear and less likely than the power to renegotiate an ongoing contract.

It wouldn’t be easy to change the law. Public employee unions have traditionally carried great influence with Democrats, even if President Barack Obama’s willingness to freeze their pay on the federal level suggests their clout may be waning. From the Republican perspective, the fiscal crisis on the state level provides a golden opportunity to defund a key Democratic interest group. For the GOP, it’s an economic and political win.