I'll give you a few clues;-
He is a CND supporter who favours the UK adopting unilateral disarmament, try selling that to a British electorate.
He is for completely untrammelled immigration, another very difficult sell,see current events.
He is for borrowing £500 billion, after recent happenings most folk are not too keen.
He has appointed an IRA, Hamas and Hezbollah lover as deputy, who do you know of the same mindset?
He has appointed Dianne Abbott- judge for yourself if this was a sound choice.
So, one or two reasons why Jezza won't be PM anytime soon.