Looks like another row is due between the Mail and the Labour Party after an unnamed aide for Chuka Umunna briefed out that it was their behaviour that so upset their boss, including a toxic claim of doorstepping a 102 year old grandmother:

No tabloid stories behind Chuka withdrawal, I'm told. Just immense media pressure (e.g. Daily Mail doorstopping mum).

— George Eaton (@georgeeaton) May 15, 2015

Mail-land is keen to stress it’s simply not true:

I'm told this is wrong. If someone did knock on the door of Chuka's mother, it was not the Daily Mail https://t.co/OkdPuuKnBv

— Jason Groves (@JasonGroves1) May 15, 2015

Guido understands that no one from the Staggers checked with the Mail to see if it was true before punting the line…