In her first speech since becoming Cabinet Office minister, Tessa Jowell expressed her support for parliamentary candidates being elected through US-style 'open primaries'.
At an event on the future of the Labour Party on Wednesday, hosted by Demos, Jowell called for an end to the "political closed shop".
And the Labour MP also expressed a desire to see her party build "an asset-owning democracy".
This included offering "a more pluralistic notion of public service ownership built around the notion of public service mutualism", she said.
"That means our political parties should be open to those who share our values but do not wish to join, companies should be open to the involvement of their employees and public services should be owned by the people through a new conception of public ownership," she explained.
"That is the very essence of progressive Labourism."
The Demos event came ahead of the think-tank's publication of a report asking 'What next for Labour?'

Dods Parliamentary Communications Ltd