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** FILE ** Conservative MP Boris Johnson in his Watlington constituency, in this photo dated July 13, 2007. Boris Johnson is to stand as a candidate to become Mayor of London, he said Monday July 16, 2007. Johnson, who has made his mark as a journalist, entertainer and Conservative member of Parliament, announced his intention, saying "The opportunity is too great, and the prize too wonderful to miss". (AP Photo / Tim Ockenden/PA) ** UNITED KINGDOM OUT - NO SALES - NO ARCHIVES **