Actually there is a clause written by Thomas Jefferson addressing the issue of slavery that was stricken from the final Declaration of Independence. Although Jefferson himself owned slaves, he wrote a strongly worded attack on the subject. It was stricken at the request of both South Carolina and Georgia, both of whom never attempted to restrain the importation of slaves and wished for the practice to continue. The following is the text of the clause.

He, King George, has waged cruel war against human nature itself, violating its most sacred rights of life and liberty in the persons of a distant people who never offended him, captivating and carrying them into slavery in another hemispherre, or to incur miserable death in their transportation there. This piratical warfare, the opprobrium of Infidel powers, is the warfare of the Christian King of Great Britain. Determined to keep open a market where men should be bought and sold, he has prostituted his veto for suppressing every legislative attempt to prohibit or restrain this execrable commerce. And that this assemblage of horrors might want no fact of distinguished caprice, he is now exciting those very people to rise in arms among us, and to purchase that liberty of which he has deprived them, by murdering the people on whom he has also obtruded them, thus paying off former crimes committed against the liberties of one people, with crimes which he urges them to commit against the lives of another.