Jon Huntsman is the victim of the latest dirty trick in this year's Republican presidential race -- but there are no apparent South Carolina fingerprints on it.

A 72-second YouTube video posted by Ron Paul supporters shows Huntsman -- a former ambassador to China -- speaking Chinese.

The video calls Hunstman a "Manchurian candidate" and questions if his adopted Chinese daughter was in fact adopted.

Paul distanced himself from the clip while campaigning in New Hampshire.

"I understand it's an ugly ad, and I've disavowed it," Paul told The Associated Press, calling the ad "way out of order."

He added, "Obviously all campaigns have to suffer these consequences when someone goes up and puts the candidate's name on there and you get bad press for it."

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Cindy McCain, wife of Arizona Sen. John McCain, tweeted about the ad: "I deeply resent the video made using the adopted daughters of @johnhuntsman. @ronpaul shame on you. This has shades of 2000 all over it."

In South Carolina's 2000 GOP presidential primary, McCain -- who has an adopted daughter from Bangladesh -- was stung by a whisper campaign that alleged, among other things, that he had an illegitimate black child.