Speaking to ITV News, David Blunkett has told those criticising Ed Miliband to "get off your bum, and get out there and campaign."
The veteran MP - who has announced he is standing down - said: "My message to people who are chipping away at Ed Miliband: forget the idea that someone else is going to step forward or there's going to be some kind of peremptory election. There isn't.
"So get off your bum and get out there and campaign. Not for any individual but for the values we espouse."
Mr Blunkett added that if Labour were to lose next year's election they could be out of power for a very long time.
More top news
Rebecca Wooller and Blake Green will marry in front of shoppers at their local branch of the store in Cambourne, Cambridgeshire.
Fans have been given the first look at the new 007 film starring Daniel Craig as the secret agent and directed by Sam Mendes.
Nicola Sturgeon will today pledge that her party will work with others to bring about "positive change" for ordinary people across the UK.