Haha, Boris Johnson is... like... the perfect English stereotype, at least, what Americans see as the stereotypical Englishman. But while the accent, the expressions and the buffonish demeanour are all real, they're only one aspect of him.
If you want a comparison, Boris is not like Sarah Palin, he's more like an English Bill Clinton. Bill has that Southern accent and informality and charm, which made everyone think he was just a good ol' boy, while in reality he was actually really smart (except when it came to women). Similarly, Boris has the accent, the strange expressions, he could be straight out of a P.G. Wodehouse novel, yes, but he most certainly has a brain and it's working all the time (he was a journalist before a politican, so he knows how the press works and he can speak German and French). But he acts like an idiot because it's useful if people think he's an idiot. You see?
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If you want a comparison, Boris is not like Sarah Palin, he's more like an English Bill Clinton. Bill has that Southern accent and informality and charm, which made everyone think he was just a good ol' boy, while in reality he was actually really smart (except when it came to women). Similarly, Boris has the accent, the strange expressions, he could be straight out of a P.G. Wodehouse novel, yes, but he most certainly has a brain and it's working all the time (he was a journalist before a politican, so he knows how the press works and he can speak German and French). But he acts like an idiot because it's useful if people think he's an idiot. You see?