The fact that you already have several holes in your head doesn't mean you want another one. Imagine being Gordon Brown this weekend. You are still reeling from disastrous local election results and the loss of London to Boris Johnson. You trail a record 26 points behind David Cameron in the polls. Rebellion surges through your party's ranks: in Westminster, over the abolition of the 10p tax rate; in Scotland, over the proposed referendum on independence. Senior Labour figures say that there will be trouble - meaning a leadership challenge - if the party does not make serious progress by...