Last night he plumbed new depths by parading his anti-democratic contempt for Leave voters as a badge of honour.
From the bitter divides in his party to helping Leave win the referendum, here are the Labour leader’s highlights so far.
Either he would be turfed out of Parliament, or his constituents would shrug and say “So what?”
While Thornberry’s official policy is to try to bog down the triggering of Article 50, plenty of her colleagues can see the danger in denying the result.
The trajectory of Venezuela’s “socialist revolution” – poverty, misery and brutal oppression – was obvious from the start to any student of politics or history.
“I don’t consider myself wealthy” – will Corbyn therefore exempt those earning less than him from any tax hikes?
The Leader of the Opposition appeared to suggest that anyone earning less than £137,000 isn’t wealthy.
Britain has traditionally been suspicious of lionising political heroes. In Corbyn we have found our weak spot.
Oddly, voters don’t appreciate being told their country is rubbish.
Smith’s line on ISIS is a disaster.
At best, he’s a Milibandish figure who believes that the hard left has won the battle of ideas in the Labour Party.
Break a campaign promise? Trash your own antisemitism report, and both your reputations? Look both incompetent and corrupt? Why not.
If he loses a snap General Election, his supporters will simply blame the “Blairite” splitters.
Any MPs who leave Corbyn’s party would be best protected by a pact with the Lib Dems. But would Farron want to grant one?
Tens of thousands of them could fail proper vetting.
In ordinary times, Labour’s situation in tonight’s vote would be a full-length catastrophe in its own right.