These instances of "Thomas Jefferson" appear in the gutenberg complete text
Mark Twain:

 >From Innocents Abroad:
On the 12th of
August, 1860, two months before the Waite and Granger affair, two South
Carolina clergymen, named John H. Morgan and Winthrop L.  Willis, one a
Methodist and the other an Old School Baptist, disguised themselves, and
went at midnight to the house of a planter named Thompson--Archibald F.
Thompson, Vice President under Thomas Jefferson,--and took thence, at
midnight, his widowed aunt, (a Northern woman,) and her adopted child, an
orphan--named Mortimer Highie, afflicted with epilepsy and suffering at
the time from white swelling on one of his legs, and compelled to walk on
crutches in consequence; and the two ministers, in spite of the pleadings
of the victims, dragged them to the bush, tarred and feathered them, and
afterward burned them at the stake in the city of Charleston.

Actually, chapter 62 of Roughing It.