Liberals love scandals, whether they're true or not. IIRC, comparisons of DNA from Sally Hemings' clan proved that they were not Thomas Jefferson's descendants, but in a lineage from a different member of the family. Other historical accounts had Hemmings leaving the Thomas Jefferson home before she reached puberty.
My take is that the big reason this Jefferson/Hemmings story got legs is idiot democrats trying to make everyone look as bad as Clinton.
I thought it was determined that the DNA trace was to “a Jefferson male” (they just couldn’t tell which). Sally herself was the half-sister of Thomas Jefferson’s beloved late wife (his father-in-law having fathered Sally with a slave and her maternal grandfather was a White sea captain), and was 3/4ths White. The claim that TJ might’ve had intimate relations with her given all this is certainly not beyond the realm of likelihood. But do we know 100% ? Nope.