Exact(4)
Despite selecting a relatively high-profile candidate, Labour has struggled to build momentum in the Hampshire constituency, party sources have acknowledged.
To be eligible to vote for their preferred candidate, Labour members were required to live in the relevant city region and have been a member of the party before 19 July 2015, a rule that has excluded a high proportion of the party's new membership, many of whom are likely to be supportive of the Labour leader, Jeremy Corbyn.
On the other hand, if Johnson is seen as the riskier candidate, Labour's abdication means that Tories may feel they can take a risk.
Another candidate, Labour's Marvin Rees, earlier released his manifesto and said it would be "naive" to give up on the scheme.
Similar(56)
The condition for the broad church, however, is groups within the party don't put up candidates against Labour candidates.
Jeremy Corbyn is MP for Islington North and a candidate in Labour's leadership election.
The cheerleaders for Tessa Jowell, the Blairite candidate in Labour's selection race, wrongly suggested Sadiq Khan was unelectable.
Jon Cruddas, another candidate for Labour's deputy leadership, said: "It's still early, but things aren't looking good.
12.47pm: Alistair Darling has "all but ruled himself out" as a candidate for Labour leader, according to the Press Assocation.
BBC London's Katharine Carpenter spoke to Conservative candidate Gavin Barwell, Labour candidate Sarah Jones and UKIP candidate Peter Staveley.
One name mentioned as a possible candidate is Labour MP Chuka Umunna.
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