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Boris Johnson is the best-known candidate to be British prime minister. That's not necessarily a good thing

London (CNN)Even if you don't pay much attention to what goes on in the UK, there's a good chance you'll have heard the name Boris Johnson before.A former mayor of London, former British foreign secretary and current media personality, Johnson finally launched his official campaign to replace Theresa May as prime minister of Great Britain and Northern Ireland on Monday. He joins a crowded field -- but he's probably the only candidate whose name resonates outside of the UK.Johnson posted a slickly produced video on social media a few minutes after US President Donald Trump stepped off Air Force One at the start of a state visit to the UK. Johnson received the tacit approval of Trump over the weekend.The timing -- which can't possibly have b ...