CSA: Confederate States of America/WMG

Fauntroy's test results were rigged.
There was a news report on how mistakes were made in DNA tests. What if those WEREN'T mistakes? What if someone had swapped Fauntroy's test results to get an outcome they wanted? All the major parties had motivation:
 * Democrats: If 'negative results' meant 'no black ancestry', then this would be used to further discredit the Republicans.
 * Republicans: If 'negative results' meant 'not pure white', then THEY would be the ones to do the discrediting, specifically of Fauntroy for passing, and of the Democrats for hypocrisy in letting someone pass right under their noses.
 * JBU: If 'negative results' meant 'not pure white', well, they'd use the opportunity to question 'well, if Fauntroy, scion of the most influential political family in the CSA, was unknowningly passing this whole time, who ELSE could be passing and not know it' and cause chaos.

Either of the latter two would eventually lead to the abolition of slavery, the Democrat scenario would cement their power for years. However, what they didn't count on were the voters believing 'guilty until proven innocent' and causing Fauntroy to lose the election, and subsequently commit suicide. Whoever did the swap felt remorse and left a 'tip' to the Proven White group that some test results might be false.

The building that houses the Lincoln Memorial in our timeline houses the Davis Memorial in the CSA timeline.
Seems a logical leap.

The slave that plays Cleofus in That's My Boy! is mentally retarded.
The Hollywood producers would want a slave that's pliable and easily manipulated, and-above all-won't realize that he isn't really free, or won't question it. (I highly doubt they'd actually FREE a slave just for a TV show.)