A high-profile supporter quit Hillary Clinton's presidential campaign on Wednesday after a remark about black Democratic rival Barack Obama was interpreted as racist.

Geraldine Ferraro, the only woman to run on a major U.S. party's White House ticket, had said Obama was leading Clinton in the race for the Democratic party nomination for November's presidential election because he was black.

Ferraro, the trailblazing 1984 Democratic vice presidential candidate, was a member of Clinton's finance committee and raised funds for the New York senator and former first lady before stepping down, a campaign spokesman said.

Clinton, who is married to former President Bill Clinton and would be the first woman U.S. president, said she deeply regrets Ferraro's comments.

"I said yesterday that I rejected what she said and I certainly do repudiate it," Clinton said at a meeting of black newspaper publishers in Washington. "Obviously, she doesn't speak for the campaign, she doesn't speak for any of my positions and she has resigned from being a member of my very large finance committee."

Obama, who would be the first black U.S. president, denounced Ferraro's comments as he made a campaign appearance in Chicago on Wednesday but said he did not think they were intended to be racist.

"I think that her comments were ridiculous. I think they were wrong-headed," Obama told a news conference after being endorsed by a group of high-ranking retired military officers.

"The notion that it is of great advantage to me to be an African American named Barack Obama and pursue the presidency, I think, is not a view that has been commonly shared by the general public," he said.

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Obama, who has built up a strong lead in the state-by-state contests for the Democratic nomination to face Republican John McCain, denied Ferraro's charge that his campaign repeatedly responded to criticism by saying it was racially motivated.