Critics are launching new attacks on a genetic study suggesting that Jefferson fathered his slave's child.
In 1802, a year after becoming president, Jefferson was accused publicly of fathering several children by slave Sally Hemings. To help settle the matter, scientists tracked down descendants of both families for D-N-A testing. In a study published in the journal Nature, they reported a match in chromosomes that pass mostly unchanged from father to son.
Barger's wife is a Jefferson descendant.