David Cameron and Nick Clegg have insisted the coalition Government will go the distance as they struggled to draw a line under bitter infighting over Lords reform.
The Prime Minister said he was "even more committed" to making the alliance last until 2015 than he had been two years ago.
But he appeared to be less certain then his deputy when asked what odds they would give on the coalition lasting until 2015.
"I'm not a bookmaker, I'm not a big betting man but I wouldn't bet against it," Mr Cameron said.
His Liberal Democrat deputy, on the other hand, said: "I would put a considerable amount of money on us seeing through until 2015 because that is what we are committed to doing and that is what we will do."
Mr Clegg dismissed the spat over changes to the second chamber as a "bump in the road".
The comments came as the leaders staged the latest renewal of their vows at a special Cabinet meeting in the West Midlands.
"I just want to say I am even more committed to coalition government, to making this coalition government, today than I was in May 2010 when Nick Clegg and I formed this government," Mr Cameron told a press conference in Birmingham. "I believe it has real purpose, a real mission."
Mr Cameron said since May 2010 there had been only "one or two episodes" like the rebellion last week, which saw more than 90 Tory backbenchers defy the Whip to vote against Lords reform legislation.
"You always have bumps and scrapes and difficulties along the way. That is the nature of politics," he said in response to questions.
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