Alastair Campbell posts about the significance of the Guardian’s story and offers his advise to Cameron:
It is not my place to advise Cameron, or Coulson. But if it were, I would be saying to Cameron to find out very quickly whether Coulson did act in any way improperly, and to act accordingly if he thinks he did. And if I were Coulson, I would be totally honest with Cameron to help him make that decision.
When the Damian McBride emails first surfaced, it was obvious where it was going to end. If Cameron thinks that this situation might also end in him having to lose his right-hand man, better to do it quickly.
As a journalist, it didn't take long for Campbell to appreciate the importance of this story and he is being fair, not only in what he says about Coulson’s role, but to the other parties involved.