Besides, it is reassuring to know that he is a friend of this country. One of his first acts as president was to remove the bust of Winston Churchill from the Oval Office, so some of us formed the view that he thought the Anglo-American relationship was no longer all that special. Seven years later, we are being proved wrong.

It turns out Mr Obama now thinks it is so special that it authorises him to take part in our electoral process.

Oddly enough, this has never happened so publicly before. True, everyone knew that Ronald Reagan wanted Margaret Thatcher to win the general elections of 1983 and 1987, but he kept his help private and did not advise the British how to vote.

Never in our democratic history can the leader of a foreign power have climbed so clearly on to our hustings to tell all our citizens what one side – 10 Downing Street – wanted.