The party's second-in-command has indicated that Andy Burnham would have triumphed in the recent Manchester byelection, while she urged her party to leverage the popular Greater Manchester mayor.
Overturning a substantial 13,000-vote Labour majority from the last general election, a local Green councillor, a community tradesperson, became the party's fifth MP on Friday. This happened in an area that had elected Labour MPs for nearly a century.
Reform UK's Matt Goodwin placed second, narrowly beating the official Labour contender, Angeliki Stogia.
The surprise result has prompted fresh debate of the party's choice to prevent Andy Burnham from contesting the seat last month.
Speaking to the BBC, Labour's deputy leader, Lucy Powell, remarked, "Andy Burnham likely could have held the seat. I think certainly the Greens wouldn't have gone after the seat in the manner that they did."
Powell was the sole member of Labour's ruling national executive committee to support allowing Burnham to stand, with the majority, including leader Keir Starmer, opposing the move.
However, she told the BBC she understood "collective responsibility" for the outcome, citing concern about necessitating a separate election in Greater Manchester.
Powell also stressed that her party must learn from the reasons for Burnham's widespread popularity in the region. She said people "see in him someone who is fighting for them, someone who is delivering those Labour values and Labour policies."
"We have to draw on that, leverage Andy Burnham, but also learn from it and consider how we could do that better across the country," she added.
Andy Burnham is understood not to have ruled out having another go at returning to parliament. A source close to him said, "With all the chaos and turmoil, who knows what might happen. It would be unwise to say he would never."
So far, Burnham himself has yet to comment on the byelection result. Meanwhile, Keir Starmer has pledged to continue despite labelling the poll result "disappointing."
Angela Rayner, a prominent voice on Labour's left, called the byelection result "a wake-up call" for the party.
In contrast, the Home Secretary is expected to caution about the party shifting leftward in response to the defeat. This comes as the government proposes legislation for tougher immigration measures next week.
A source close to the Home Secretary was reported stating, "The party should not misinterpret the message from its electoral setback. The idea that we are losing Muslim voters over immigration is simply incorrect."
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