Exclusive: multiple sources sound the alarm after a messy week that has seen a rump of party’s union base abandon it

On Wednesday afternoon, Ben Carroll was sticking french fries in his soft serve at his local McDonald’s when the ground moved under him.

A major union had just decided to pull funds from his campaign and declared him a lost hope. As Carroll travelled in a red bus with the slogan “fighting for working people” splashed across it, another union called him a liar who had “chosen not to show up for workers”.

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