It is hardly uncommon for politicians to lie, especially when their careers are threatened by a sexual transgression — John Profumo about Christine Keeler, for example, and Bill Clinton on not having had ‘sexual relations with that woman, Miss Lewinsky’. But there is a particular kind of distortion of the truth that is rare over here but almost routine among American presidential candidates; and this is the way they embellish their personal histories to maximise their appeal to voters.