As prominent Jeremy Corbyn allies and hundreds of councillors quit the Labour, Patrick Maguire asks how Keir Starmer pushed them to the fringes and whether the left has an electoral future outside of the party. 

Plus: A taster of the latest episode of How to Win an Election, where political masterminds Peter Mandelson, Polly Mackenzie and Daniel Finkelstein answer your questions. 

How To Win An Election (00:55)

Should The Left Leave Labour? (09:34) 

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