TOKYO (AFP) - Former US presidential contender Mike Huckabee urged his fellow Republicans on Wednesday not to denigrate Democrat Barack Obama, saying they should celebrate the historic moment of a black candidate. "Republicans will make a fundamental if not fatal mistake if they seek to win the election by demonising Barack Obama," Huckabee told a news conference on a visit to Tokyo. The former Arkansas governor said that, having grown up in the segregated South, he never thought he would see an African-American win the nomination of a major party for the US presidency. "I do not want to have...