“I believe the entire records of the world, from the date of the Declaration of Independence up to within three years ago, may be searched in vain for one single affirmation, from one single man, that the negro was not included in the Declaration of Independence; I think I may defy Judge Douglas to show that he ever said so, that Washington ever said so, that any President ever said so, that any member of Congress ever said so, or that any living man upon the whole earth ever said so, until the necessities of the present policy of the Democratic Party, in regard to slavery”

Fifth Lincoln-Douglas Debate http://www.bartleby.com/251/pages/page328.html (7 October 1858), regarding Stephen A. Douglas and the antebellum Democratic Party's claim that African Americans were exempt from Thomas Jefferson's assertion that all men were created equal.
1850s, Lincoln–Douglas debates (1858)
Context: The Judge has alluded to the Declaration of Independence, and insisted that negroes are not included in that Declaration; and that it is a slander upon the framers of that instrument, to suppose that negroes were meant therein; and he asks you: Is it possible to believe that Mister Jefferson, who penned the immortal paper, could have supposed himself applying the language of that instrument to the negro race, and yet held a portion of that race in slavery? Would he not at once have freed them? I only have to remark upon this part of the Judge's speech, and that, too, very briefly, for I shall not detain myself, or you, upon that point for any great length of time, that I believe the entire records of the world, from the date of the Declaration of Independence up to within three years ago, may be searched in vain for one single affirmation, from one single man, that the negro was not included in the Declaration of Independence; I think I may defy Judge Douglas to show that he ever said so, that Washington ever said so, that any President ever said so, that any member of Congress ever said so, or that any living man upon the whole earth ever said so, until the necessities of the present policy of the Democratic Party, in regard to slavery, had to invent that affirmation. And I will remind Judge Douglas and this audience that while Mister Jefferson was the owner of slaves, as undoubtedly he was, in speaking upon this very subject he used the strong language that “he trembled for his country when he remembered that God was just;” and I will offer the highest premium in my power to Judge Douglas if he will show that he, in all his life, ever uttered a sentiment at all akin to that of Jefferson.