Jonathan Alter
Bloomberg News Columnist

As President Barack Obama and congressional Republicans trade shots on the budget, it's getting harder to see how they'll pull back from the brink and avoid a cataclysmic default.

With only a month to go before the Aug. 2 deadline for raising the U.S. debt limit, this feels like a financial version of the 1964 Cold War thriller Fail-Safe -- a helpless stumble toward disaster.

At his news conference this week, the president argued against an all-nighter negotiation by invoking his daughters' doing their homework early. This brought back memories of President Jimmy Carter, in a 1980 debate, saying that he discussed nuclear war with his daughter, Amy, which didn't go over well at the time. Better for Obama to skip the daughters and stick with the nukes.

As David Walker, the former comptroller general and a leading voice for fiscal sanity, puts it: "When you're playing with a tactical nuclear weapon, you don't want to take the timing device down to the last seconds."

Walker, who served under presidents of both parties, holds no official position in the current talks, but he's been playing the role of go-between. In two months of low-key shuttle diplomacy, he's met privately with John Boehner, Harry Reid, Mitch McConnell, Tim Geithner, Ben S. Bernanke, Eric Cantor, Steny Hoyer, Gene Sperling, and the heads of all of the relevant congressional committees.

Time Is Short

Details of these talks are skimpy, so I don't know how the parties are reacting to Walker's ideas. But time is short, fresh thinking scarce and the impasse seemingly unbridgeable: Republicans say they can't support a deal with tax increases, and Democrats say they can't support one without them. The numbers seem much too big, and the policy choices much too complicated, for a full solution by Aug. 2.

The Walker Compromise might just be the way out.

Like Tom Coburn, one of the Senate's most conservative members, Walker says there's no way to save $4 trillion over 10 years (the number agreed on by both parties) without both spending cuts and tax increases. But the latter, anathema to Republicans, will have to be finessed to get to an agreement. So Walker's remedy for a debt-limit deal is three-fold.

Three-Part Plan