The Guardian's Patrick Wintour looks at which Labour leadership candidate is likely to win the most support from the trade unions.
2. The case against Ed Balls 
Tom Bage of Labour Uncut responds to Kerry McCarthy's  Staggers post, arguing that Balls is perceived as being more directly implicated in the bitter battles of the Brown-Blair era than the other candidates.
3. An electoral problem 
As new data shows how many young Lib Dems failed to vote, Mark Pack explores ways for the party to improve this state of affairs.
With two days left until nominations for Labour's London mayoral candidate close, Oona King has revealed that she is backed by 11 MPs across the capital. Sunny Hundal  has the details.
5. Ireland: United it stands? 
Jon Snow wonders whether the burgeoning nationalist middle class in Northern Ireland would actually vote to unite with the south.