Campbell's resignation: reaction in quotes

"It points the finger at Tony Blair because he (Campbell) worked under Blair's regime.

"Blair is responsible ultimately for the loss of trust because he allowed the methods Campbell employed to operate.

"I think we have seen it from the beginning, this absolute obsession with the media ... We have seen it repeatedly, the way in which these methods have been employed. It is the ultimate in cynicism.

"They do have a strong bond and that makes Blair all the more culpable. We have seen the most appalling era of government communication."

- The home secretary, David Blunkett

Also a selection of some of Mr Campbell's best - and worst - spin doctoring.