Liz Kendall has promised that to fight “till the very end” after a Labour leadership poll put the shadow care minister in last place as Jeremy Corbyn enjoys a surge in support.

He spoke as a YouGov poll published on Wednesday showed left-wing candidate Jeremy Corbyn, who had previously been regarded as an outsider, could become the party’s next leader.

Praising the example of the city’s mayor, she said: “You look at what Joe Anderson’s doing, being a mayor for jobs and for education and for a vibrant dynamic economy for Liverpool for the future – fighting against the Tories and delivering Labour’s values because he’s elected and in Government”.

The study also forecast that if Ms Kendall and Ms Cooper were eliminated and second preferences redistributed under the alternative vote system, Mr Corbyn would beat Mr Burnham by 53% to 47% in the final round.

The problem, Mr Field said, was that the other candidates had “not responded in the way I hoped they would in taking the argument to him about whether he is or is not a deficit denier”. This led Nicola Sturgeon to comment that indeed David Cameron is not lord of all he surveys and will not if the SNP have anything to do with it always get his way.

And he mocked people who say their political heart wants to support Mr Corbyn, telling them bluntly: ‘Get a transplant.’. “I think a repeat of that is highly unlikely and highly undesirable”.

The split in thinking between left-wingers and centrists was highlighted this week when 48 Labour lawmakers defied the party’s interim leadership to vote against planned government cuts to welfare.

The peer, a former flatmate of Tony Blair, said that while Ms Kendall and Yvette Cooper were both talented politicians, neither was likely to be able to see off the hard left challenge of Jeremy Corbyn.

The incredible thing is that Blair’s legacy of dishonesty and destruction in Iraq is not even the most glaring hole in his credibility.

Lord Mandelson, one of the key architects of New Labour, said the party was struggling to deal with the “terrible legacy” left by Ed Miliband.

Ex-deputy Prime Minister Lord Prescott this morning urged the party to “calm down“, but fuelled tensions on BBC Radio 4’s Today by adding that Mr Blair’s suggestion that those who backed Mr Corbyn in their hearts should get a transplant was “unacceptable“.

The rival for UK Labour’s leader has infuriated Tony Blair and called for progressive taxation, better social services and infrastructure investment.

Corbyn, speaking to reporters in central London, rejected Blair’s criticism and said Labour had not lost the election for being too left-wing, but for offering “austerity-light”. “It’s like going back to Star Trek or something”.

But Mr Corbyn said: “Maybe they can think again at the excitable mindset they were in when they made these remarks”.

Professor John Gaffney, Professor of Politics at Aston University and Co-Director of the Aston Centre for Europe, says: “Of course Corbyn is the most popular candidate for leader”.

Pressed by the other candidates to say whether he could ever vote No, Mr Corbyn said that “if Europe becomes a totally brutal organisation which treats member states in the way it has treated Greece”, then it would lose the support of many people.