After all the shenanigans of yesterday, David Cameron has clearly decided that Gordon Brown has survived the botched coup attempt by Hoon and Hewitt.
If the Conservatives felt that the Labour chaos had legs then he would be leaving the airwaves to the various factions. There is nothing better for the Tories than Labour tearing itself apart. But instead, Cameron is wading into the mess and declaring the PM to be 'in deep trouble'. Labour MPs may hate each other, but they will unite in hating Conservatives more.
I can only assume that Cameron is saying this in the hope of prolonging the story for another news cycle. In reality, he knows that the coup has failed.