In the Roosevelt Room after the session, the Treasury secretary, Henry M. Paulson Jr., literally bent down on one knee as he pleaded with Nancy Pelosi, the House Speaker, not to "blow it up" by withdrawing her party's support for the package over what Ms. Pelosi derided as a Republican betrayal.

"I didn't know you were Catholic," Ms. Pelosi said, a wry reference to Mr. Paulson's kneeling, according to someone who observed the exchange. She went on: "It's not me blowing this up, it's the Republicans."

Mr. Paulson sighed. "I know. I know."