In regard to Jim Dixon's reply about the last verse being a "floater":

Jeff Davis was a gentleman; Abe Lincoln was a fool.
Jeff Davis rode a dapple gray; Abe Lincoln rode a mule.


I recognize that verse from a song called "OLD ABE LIES SICK".

Old Abe lies sick, Old Abe lies sick, Old Abe lies sick in bed. He's a lying dog, he's a crying dog *[and I wish he was dead].

Jeff Davis rides a big white horse, Abe Lincoln rides a mule.
Jeff Davis is a gentleman, Abe Lincoln is fool.

*Another version adopted after Lincoln's assassination replaces "and I wish he was dead" with "with murder in his head".