Patricia Hewitt and Geoff Hoon have written to Labour MPs saying the party was "deeply divided" and the issue must be sorted out "once and for all".
Downing St said Mr Brown was "getting on with the job" and cabinet ministers have been lining up behind him.
When are we going to see "Doing the right thing, because it's the right thing to do?" or maybe "totally committed to doing what is right"?
And which ministers are "lining up"?
As the day progressed, cabinet ministers voiced their support for Mr Brown's leadership, including Home Secretary Alan Johnson - sometimes touted as a future Labour leader - Justice Secretary Jack Straw, Chancellor Alistair Darling, Energy Secretary Ed Miliband and Business Secretary Lord Mandelson.
So that's five mentioned there. Can't have been a very long fucking line.