Labour Party
She will formally announce her bid on Monday morning.
Union boss Len McCluskey tore into the deputy Labour leader.
'They peddled Project Fantasy.'
'There will be no split, there will be no retreat'
He fought fiercely against Blair's decision 13 years ago.
'Politicians and political parties can only grow stronger by acknowledging when they get it wrong'
But he admits many people will never believe him.
'Prepare to be Coxed.'
Total membership will hit 500,000
'It's not good enough.'