Edith Childs, the black councillor who has become a talisman for Obama's campaign after giving him his "Fired Up! Ready To Go!" campaign slogan, said black voters in her home state were "insulted" by Mrs Clinton's attempts last week to downplay the role of Martin Luther King in the passage of civil rights legislation.
In an interview with The Sunday Telegraph, she also expressed dismay at a campaign speech by Bill Clinton, which some interpreted as a claim that Obama's candidacy was a "fairy tale".
Mrs Childs' intervention is proof that race will be front and centre of the Democrat showdown in South Carolina next Saturday.
She said: "I was insulted. Then I sat there and began to think: that's what the Republican party wants. It wants the Democrats to be divided and they have been. They could both have been less racist. It's not a nice word but there you go.
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