Labour lost because of the media's successful campaign linking them with the SNP and the chaos that alliance would bring. They also failed to present a coherent message of better economics and social strategy. Then there was Ed Milliband..
A leader, who is seen as that, and a viable economic...
Dan Jarvis is the populist and glamour candidate. He lacks experience.
I suggest Andy Burnham is the safest best. There needs to be a period of reform. I think he'll get the backing of the Unions too.