When does The Sun swing behind Cameron? Murdoch will know that if he is to do that, he has got to do it soon. There is a mistaken view that The Sun’s endorsement before an election is what matters. It is not. It is The Sun’s drip-drip support, week in, week out over a prolonged period that builds somebody up and destroys whoever is the alternative. It is the positive and negative effect that is so powerful. If The Sun is really going to get behind Cameron, then it has to do it this year – I would say by the autumn. But first they have got to make up their mind if they think Cameron is a winner.