Quentin Davies' letter to David Cameron laid out what was - for me - the most respectable of all possible reasons for leaving a political party. Cameron neither understands nor cares to provide decent or responsible representation.
It's a detail that should obscure any debate on actual policies, and it's refreshing that Davies has chosen it as the public reason for doing what he has done (whatever the real reason may be).
While I was never very enthusiastic about other Tory defectors, I think that there is - at the moment - a place for pro-democracy Tories in The Labour Party, and if it helps us to make responsible representation the battleground that Labour fights the next election on, this can only be a good thing.
Tony Blair's early years (with the obvious exception of his resolution over Kosovo) were terrible, precisely because of Labour's disregard for many of the basic standards of liberal democracy. That this is an attack on them for staking out ground that Brown is thankfully abandoning makes me very optimistic about the future of my party.
(Just before hitting 'publish', I notice this in my RSS reader. Great minds...)