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Labour‘s painful leadership race ends tomorrow with Jeremy Corbyn expected to be announced ​as party boss for the second time in a year.

Mr Corbyn is set to win a second mandate after a bitter two-month battle against former Shadow Cabinet Minister Owen Smith .

The result will be revealed at 11.45am in Liverpool as Labour’s annual conference gets underway.

Meanwhile, Mr Corbyn has been hit with a formal complaint by the Campaign Against Anti-Semitism.

The group has taken action over a video posted on his official Facebook and Twitter accounts.

In the film, Mr Corbyn’s supporters answer questions on topics they are “tired of hearing” about, including whether they promote anti-Semitism.

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The CAA has written to deputy leader Tom Watson urging him to raise the issue with Labour’s ruling national executive committee.

The letter accuses Mr Corbyn of “committing acts that are grossly detrimental to the party, namely characterising Jewish people as dissembling and dishonest in their reporting of anti-Semitism, and by using the influence and prestige of his office to disseminate and normalise that lie”.

It goes on to list a series of incidents where it says Mr Corbyn and his supporters dismissed allegations of anti-Semitism.

Mr Corbyn’s hopes to move on from the infighting which has plagued his first year in office suffered a treble blow today as Harold Wilson’s former press secretary warned Labour “will lapse into a coma from which there is no recovery” if ​he is re-elected.

(Image: Jeff J Mitchell)

Joe Haines branded the Corbyn-inspired Momentum wing the 21st Century version of Militant - and urged moderate MPs to form a new parliamentary party to take on the Tories.

Haines, an-ex Mirror assistant editor who was at Wilson’s side from 1969-76, feared Militant was “back with even greater menace”.

He said: “The tragedy is that now there is no leader to denounce them. For the leader of the Labour Party today is the hard-Left’s inspiration.

“They are no longer called Militant. The name is now Momentum. Same difference.”

He wanted Labour moderates to have the “courage” to stand up against the leadership, saying: “Where are the up-and-coming heroes? Why don’t they speak up?

“The answer is that they fear they will be de-selected, that’s why.

“Fear that a Left-winger will be put in their places to fight the next election.

“Well, I’ve got news for them. Unless they fight and win this battle, there will be no Labour Party left to select them and no voters to elect them during the next one.”

The ex-aide called for a fresh rebellion against Mr Corbyn, repeating calls for a new party with the word “Labour” in its name.

“All it needs is courage. Courage to face the row. Courage to face the threats that would inevitably come in a torrent on Twitter and Facebook. Courage to put the party and the country before their own comfort. But it is that courage which — apart from being displayed by a handful of brave backbenchers — is missing today,” he wrote in the Daily Mail.

“It is better for today’s Labour grandees to fight and lose against Corbyn than never to fight at all.”

A YouGov poll for The Times today revealed the scale of Labour’s challenge in winning over Brexit -backing supporters.

Just 48% of Labour voters who chose to leave the EU would continue to support the party at a general election, according to the survey.

Cheeky Lib Dems will bid to capitalise on Labour’s woes on Sunday, running a recruitment stall outside the conference centre.

Referring to the video, Mr Corbyn’s spokesman said: “When it was pointed out that the way in which the video was edited may cause offence, we apologised and withdrew the video immediately.”

Mr Corbyn is expected to try and reunite Labour’s warring parliamentary party if he wins tomorrow.

His MPs supported a no-confidence motion in his leadership by 172 votes to 40 in June.

But Mr Corbyn’s refusal to quit triggered a leadership challenge, first from Angela Eagle and then from Mr Smith, with Ms Eagle stepping aside.

A reported 550,000 members were eligible to vote in the race.