Speculation swept Westminster that he could walk out as early as this afternoon as the two other main parties sought their backbenchers' agreement over an alliance that will end the political deadlock.
As Mr Cameron began to brief the shadow Cabinet and Nick Clegg spoke to a meeting of Lib Dem MPs at Westminster, one senior Tory indicated a deal could be close.
'I hope so,' said Mr Cameron's Commons aide, Desmond Swayne, when asked if he expected him to be Prime Minister tomorrow.
Mr Brown this morning held another clandestine summit with Mr Clegg, his second in 24 hours, but it looks increasingly likely that he is to be frozen out of Number Ten.
Let me make this very clear Gordon Brown is a cunt.