It's a fickle business politics.
The man who resigned his ministerial job tonight to call for a leadership election declared on television just a few weeks ago that Gordon Brown was the right man to see us through. That, though, was before Labour lost the Glasgow East by-election which David Cairns had campaigned in day after day.
Mr Cairns insists that he's not part of a plot and had resigned with a heavy heart. The signs are that's the truth. Faced by a hardening of opinion in the cabinet that now is not the time for a leadership contest a growing number of more junior figures are going public with their belief that that debate cannot and should not be avoided.
Everyone involved in this is asking the same question? Where will it end? Everyone has the same answer - I don't know. This is not a battle between two camps with fixed views. People from the cabinet down are - like Mr Cairns - changing their view day by day.
Oddly, the one thing that may give the prime minister hope tonight is the severity of the economic news. Is this - his friends will ask - really the time to create even more instability and uncertainty?
BBC One's Question Time (July 3rd): "GB is the man to see us through these difficult economic circumstances...I am absolutely convinced that GB is the right man to see us through."