And now his compadre El Gato has dived into the political fray.
The leader of the opposition talked about El Gato in an interview a few months ago, revealing that his pet cat is so called because he never actually bothered to give it a name:
[My pet is a] black and white cat. I always call it 'El Gato', which is just Spanish for cat. When I see the cat I say, 'Buenos dias, El Gato'.
Actually, cats don't know their name, cats know voices. What he does respond to when I ask him to come in, is the tune of 'Tie a Yellow Ribbon Round the Old Oak Tree'. I whistle to it. I can't sing, you see.
It has since been speculated that El Gato is a shining beacon of socialism.
He's won himself quite a few fans - including, apparently, ITV News' Allegra Stratton, who on Sunday asked Corbyn to follow up on a promise made on Peston on Sunday last week to send a picture of the famous cat:
Corbyn obliged - but used the opportunity to score a political point.
Posting a picture of El Gato on a chair in the back garden on Sunday morning, the caption read:
...had to go outside to take picture of El Gato as he’s not too impressed with your guest.
The guest who was on air at on Peston on Sunday at the time? None other than David Cameron.