At a Friday caucus meeting, just before her press conference, she told Democrats the idea's a no-go, according to Rep. Barney Frank (D-MA), who also believes setting debt limit is in Congress' purview. "The leader said she agreed and there was general agreement with that. I do not think the 14th amendemnt option is alive in anyone's mind. It would be a terrible idea," he said as the meeting broke.
Not much to add to that, except that the Treasury Department has also foreclosed on the idea of blowing past the debt limit if Congress fails to act. In a statement to the New York Times, Treasury's General Counsel wrote, "Secretary Geithner has always viewed the debt limit as a binding legal constraint that can only be raised by Congress."
Additional reporting by Benjy Sarlin.