Obama´s "outrageous and exorbitant hypocrisy" with regard to Brexit

We are told that Barack Obama is planning a visit to the UK in order to urge British voters to stay in the EU.

Before arriving Obama should read what Boris Johnson writes:

The American view is very clear. Whether in code or en clair, the President will tell us all that UK membership of the EU is right for Britain, right for Europe, and right for America. And why? Because that – or so we will be told – is the only way we can have “influence” in the counsels of the nations.
It is an important argument, and deserves to be taken seriously. I also think it is wholly fallacious – and coming from Uncle Sam, it is a piece of outrageous and exorbitant hypocrisy.
There is no country in the world that defends its own sovereignty with such hysterical vigilance as the United States of America. This is a nation born from its glorious refusal to accept overseas control. Almost two and a half centuries ago the American colonists rose up and violently asserted the principle that they – and they alone – should determine the government of America, and not George III or his ministers. To this day the Americans refuse to kneel to almost any kind of international jurisdiction. Alone of Western nations, the US declines to accept that its citizens can be subject to the rulings of the International Criminal Court in The Hague. They have not even signed up to the Convention on the Law of the Sea. Can you imagine the Americans submitting their democracy to the kind of regime that we have in the EU?