Video: Boris Johnson: 'If I am a mop then, Dave, you are a broom' The Mayor of London wished David Cameron a happy birthday, before replying to the Prime Minister's earlier comment that Boris Johnson was a "blonde haired mop" with the retort that Mr Cameron is "a broom that is cleaning up the mess left by the Labour government." Mr Johnson continued with the cleaning analogy to the laughter and applause of delegates to the Conservative Party Conference.