WASHINGTON -- Senators bickered Sunday over who's to blame for lurching the country toward a year-end "fiscal cliff," bemoaning the lack of a deal days before the deadline but bridging no differences in the debate. With the collapse Thursday of House Speaker John Boehner's plan to allow tax rates to rise on million-dollar-plus incomes, Sen. Joe Lieberman said "it's the first time that I feel it's more likely we'll go over the cliff than not," meaning that higher taxes for most Americans and painful federal agency budget cuts would be in line to go ahead. "If we allow that to happen it will be the most colossal consequential act of congressional irresponsibility in a long time, maybe ever in American history because of the impact it'll have on almost every American," said Lieberman, a Connecticut independent. Wyoming Sen. Jon Barrasso, a member of the GOP leadership, predicted that the new year would come without an agreement, and he faulted the White House. "I believe the president is eager to go over the cliff for political purposes. He senses a victory at the bottom of the cliff," he said. Democratic Sen. Kent Conrad of North Dakota, chairman of the Senate Budget Committee, was incredulous at Barrasso's assertion that 'there is only one person that can provide the leadership" on such a matter vital to the nation's interests. "There are 535 of us that can provide leadership. There are 435 in the House, 100 in the Senate and there is the president, all of us have a responsibility here," he said. "And, you know what is happening? What is happening is the same old tired blame game. He said/she said. I think the American people are tired of it. What they want to hear is what is the solution?" No solution seemed any nearer, with Obama and Congress on a short holiday break. Congress is expected to be back at work Thursday and Obama in the White House after a few days in Hawaii.