What do the Labour leadership candidates need to do to win?

As the race to replace Corbyn begins, John Rentoul examines the hurdles facing each of the frontrunners

The long haul to 4 April has started (PA/Reuters)

The contest for Labour leader is taking shape. The first stage began yesterday, as the six declared candidates started signing up the 22 MPs and MEPs they need in order to advance to the next stage. It is now becoming clearer what each must do to win.

Keir Starmer

As the early favourite, he needs above all to avoid mistakes. That plays to his strength as a cautious and precise personality, but he also needs to inspire party members enough to prevent Rebecca Long Bailey in particular from stealing his supporters.