Thomas Jefferson and Slavery
Thomas Jefferson was a consistent opponent of slavery his whole life. Calling it a “moral depravity” and a “hideous blot,” he believed that slavery presented the greatest threat to the survival of the new American nation. Jefferson also thought that slavery was contrary to the laws of nature, which decreed that everyone had a right to personal liberty. These views were radical in a world where unfree labor was the norm.
http://www.monticello.org/site/plantation-and-slavery/thomas-jefferson-and-slavery
To rate these persons on the issue one can’t necessarily use a blanket yes/no. One would also need to ask: how did their practices compare with the practices that were common in that time and place?
Interesting opinions, given that he was a slave owner.
All this while owning 700 slaves his whole lifetime.