Boris makes gaffes on purpose, because he takes the pee out of the hypersensitive 'don't offend anyone, lest we lose their vote' elements of his party. Romney, apparently, doesn't know, when he commits a gaffe, that it is a gaffe. He genuinely can't understand what it's like to be an ordinary American; why should he, he has no experience, even indirectly. He is a venture capitalist, a hedge fund man, a reader of balance sheets, not an employer who you would see on 'the shop floor' like Philip Green or Sam Walton who do ( did, in Walton's case) understand the mechanics of a business and the thinking of a workforce at a personal level.