The article links to the original source: https://freedomonthemove.org Scrolling down, one sees an ad from none other than Thomas Jefferson: > In Alberale, a Mulatto slave called Sandy, about 35 years of age, his stature is rather low, including to corpulence, and his complexion light; he is a shoemaker by trade, in which he uses his left hand principally, and is something of a horse jockey; ... Whoever conveys the s…
Perhaps they simply viewed one as the goal to strive towards, and the other as the current, unfortunate state of reality. Especially given that they had a civil war not six decades after Jefferson's presidency, and paid a high price in their own blood to secure those rights.
Edit: By 'they', I meant people in general, not specifically Washington and Jefferson.