Labour leadership: Candidates clash in Liverpool hustings as Keir Starmer takes early poll lead
Follow how the debate unfolded
Shadow foreign secretary Emily Thornberry was struggling to make up ground as she launched her campaign on Friday, with prominent backbenchers Lisa Nandy and Jess Phillips also trailing behind.
The hustings in Liverpool on Saturday also saw a clash between deputy leadership hopefuls, where Angela Rayner, the shadow education secretary, is the clear favourite.
Who are the candidates and what do they stand for?
The Islington South and Finsbury MP, who narrowly secured the necessary support from MPs to enter the race on Monday, insisted she was the best placed to oust Boris Johnson as prime minister within five years.
"Boris Johnson has all sorts of problems with women. And he is going to have an even bigger one if I become leader of the Labour Party," she told the Press Association.
"I think that he has a problem with women. I have spoken to a number of women who have said that the way he deals with them - and they are younger women - is that he flirts with them.
"He makes light of them and he undermines them. He has problems with women such as myself. He doesn't know what to do with me. I think that he doesn't know how to relate to women."
She added: "I think that a competent alternative government could get back into power within five years."
She also vowed to "shake up" the way government works, and put power into the hands of voters.
Described as a "continuity Corbyn" candidate said to be favoured by the current leadership and backed by campaign group Momentum, her supporters have bridled at the description.
As she took to the stage at the Museum of Science and Industry, some of the 300 or so supporters at the event broke into a chant of "Oh Jeremy Corbyn".
Ms Long-Bailey told them: "Hey guys, we're going to have to think of a new song you know. No pressure."
When was asked why Labour had failed with voters, returning their worst electoral result since 1935, she said: "I think for me we had some fantastic policies, I know because I helped write some of them, and really the message didn't resonate with our voters. And what we should have been talking about is aspiration.
"Because everything we are trying to build and I am going to try to build as leader of the Labour Party is about realising the potential, truly realising that quality of life increase, whether you are a business, whether you are an industry or an individual, our role as a party is to improve your living standards and the wealth you can accumulate as communities.
"And we didn't say that. We didn't match that with a message of aspiration. We want an economy where everyone does well."
"That's what we are applying for. In the end we have to wade through an awful lot of s**t."