The chamber and other business groups have pressed with increasing urgency for Congress to raise the maximum amount that the government can borrow. They have cataloged the consequences of default at meetings, parties and dinners and over drinks.

On Tuesday, the chamber threw its weight behind the proposal of the House speaker, John A. Boehner, telling recalcitrant Republicans that a pending vote on the plan was a with-us-or-against-us moment that would be remembered during the next election campaign.

But as the government runs out of money, those efforts have not produced the desired result. The freshman class of House Republicans, along with longer-serving members, is balking at Mr. Boehner's plan, let alone anything that Senate Democrats and the White House might be willing to accept.