He's arguing that if we leave the EU the world will immediately dissolve into a state of war, famine, plague and Mantovani.
So why did he risk unleashing this apocalypse by offering a referendum as a sop to a few grumpy MPs and UKIP voters?
If he loses (and it is looking, insanely, like he will) he is finished; if he wins, all the problems that made him offer the referendum remain, and are worsened, if anything. It shows an impressive lack of strategic foresight.
But then, we are talking about the man who could only manage a draw against Gordon Brown, even with the 2008 Financial Crisis to help him. And could only defeat his coalition partner in 2015, not Ed Milliband's Labour in 2015.
A hopeless clown, a blustering buffoon, strutting and fretting and soon to quit the stage.
The only Prime Minister of the 21st century so far, to whom the label, "As bad as Blair," can be applied.
Anyway, get used to this: