Dropping the requirement that the amendment pass both houses before the debt ceiling can be raised probably will cause a number of Republicans in the House to vote no. As a result, Boehner will need support from Democrats to pass the bill to make up for GOP defections.
"I think it may need anywhere from 60 to 100 Democrats," Ross said.
House Minority Leader Nancy Pelosi (D-San Francisco) issued a carefully hedged statement on that point, saying, "We all agree that our nation cannot default on our obligations and that we must honor our nation's commitments to our seniors, and our men and women in the military.
"I look forward to reviewing the legislation with my caucus to see what level of support we can provide."
In his conference call with Republican members of the House, Boehner described the deal as a considerable victory, according to sources who listened to the call. The sources spoke on the condition of anonymity to describe the conversation.
Boehner reminded the group that the president had started the debate calling for a debt limit increase with no conditions.
"Now listen, this isn't the greatest deal in the world," Boehner said, according to a source familiar with the conversation. "But it shows how much we've changed the terms of the debate in this town."