Ed Miliband is expected to seek to draw a line under the Blair-Brown era and tell Labour delegates that a new generation is in charge, in his first speech as Labour leader.
Political editor Nick Robinson told the programme that Ed Miliband needed to address the "deep anxiety" within the party, following his narrow victory over his brother, who was supported by a majority of cabinet ministers and constituencies.
"He has to persuade them that they made the right choice," he said.
"Up till now, it seems to me, he has largely succeeded by telling us what he isn't," Nick Robinson explained, with a campaign resting on defining himself as not New Labour, not Tony Blair or Gordon Brown, and not his own brother.
In his speech, Nick Robinson believes, Ed Miliband will now set out what he is, and how he will challenge the "new certainties" in New Labour thinking on immigration, wages and business.
"I understand your anger," he is expected to tell Labour party delegates.
Get in touch with Today via
or text us on 84844.