I have now heard from two sources that Ken Livingstone is telling anyone who will listen that he intends to run for London mayor again in 2012. This is a miserable prospect for Labour. But you have to take your hat off to Livingstone for his stubborn refusal to admit defeat. Livingstone, who turns 63 later this week, will be 66 in the run-up to the next mayoral election. Perhaps the time to retire gracefully?