While the left typically agonise over ideas and values, the Tories never place principle before power, and so Johnson has proven no different. But there are a number of troubling qualities fans of his ever-so-funny routine have to watch out for.
In the first place, as anyone who's had contact with Johnson knows, it's all about him. It's his show. And in the 57 varieties of Leave, well, there are some pretty gargantuan egos that are not going to lean back and keep the limelight to himself. Whatever one thinks of George Galloway, for instance, he is a man not noted for his retiring modesty. Ditto with UKIP. Nigel Farage has established himself as the preeminent motormouth on all things EU-related, and has helped take his party from nowhere to third place in last year's general election - no mean feat. As such he probably, and not unjustifiably, might bristle at the circus now surrounding and amplifying Johnson, especially as it's pretty likely he'll do no campaigning work beyond the odd media appearance and set piece.
And that comes to the second point: his laziness. Anyone possessing a passing acquaintance with Johnson's biography knows him to be an idler. Everything he has achieved has been through leaning on people, having doors opened and ladders dropped for him - be it as Telegraph hack, Spectator editor, or during stints as an MP and mayor. Like a layer of politicians who've entered the Commons in the 21st century, struggle is something other people have to do, and upto and including on their behalves. If it's too much work and doesn't interest him, he's not arsed. In that case, Leave are welcome to his unique gifts of hot air and baseless hype.
There is then his self-obsession. Some in the Leave campaigns might look at it philosophically and think why he's decided to throw his lot in with them doesn't matter: the fact established is one of the best known and most-liked politicians in the land is backing an exit. Firstly, they're overestimating his pulling power. As incredible as it may seem, the only figure whose position mattered as far as a significant chunk of the voting public were concerned was the Prime Minister's. A snake oil salesman he may be, nevertheless Dave is seen as someone who is polished, competent, and fair-minded. Few are going to trouble themselves over his theatrical wheeling and dealing this last week. If staying is good enough for him it's good enough for others. Never underestimate the legitimacy of his office. Second, everyone knows this is Johnson's pitch for the Tory leadership. His pro-EU comments are the stuff from which a thousand Remain leaflets can be made. Everywhere he goes between now and June, he will be asked, nay plagued with questions about his ambitions - so don't expect him to take on any debates or tough tete a tetes with Andrew Neil and co.
Lastly, it's self-evident from the standpoint of the short, medium, and long-term interests of British capitalism that it retains free, unfettered, and stable access to European markets both for the continued health of the country's home grown businesses and as the key destination for foreign direct investment from outside of the EU. In the classical understanding of sectarianism as outlined by Marx and Engels in the Manifesto, Johnson has put his petty ambitions before the interests of his class. And in so doing has shown himself ill-suited to lead a Conga line, let alone a government.