Regret at career cut short
It is hard to remember a ministerial career so short which has made more impact or a resignation that has been greeted with such widespread regret.
David Laws clearly decided that he could not simultaneously deal with outing himself, defending himself against charges of abusing expenses and being the public face of the coalition's cuts.
His departure robs the government not just of a powerful partnership at the Treasury but of another vital pairing behind the scenes - that between the new Chief Secretary Danny Alexander and Oliver Letwin who shaped, and have been managing, the coalition's policy agreement.
This morning I wrote that my hunch was that David Laws could survive. I should have paid more attention to my previous paragraph which made clear that although he'd acted to protect his privacy he'd done so, ultimately, at public expense. A position which he obviously felt he could not justify.