According to the BBC:

Senior Labour figures have rallied around Gordon Brown following the party’s crushing defeat in the Crewe and Nantwich by-election.

Health Secretary Alan Johnson told the BBC there was “absolutely no appetite within the party to change the leader”.

Former deputy PM John Prescott said Labour was going through a “bumpy ride”, but suggestions that Mr Brown should step down were “nonsense”.

How do I summarise that in one word…

I know: unassailable.

Saleable would probably do just as well, though, for the current administration. Not sure if they would still get £1m, though, for their favours.