Well, we knew that Fox can't distinguish between two black people, and now we find out that they can't even distinguish between two people with similar last names.
When discussing that Clinton has challenged Obama to what she styled a "Lincoln/Douglas" debate, Fox flashed an image on the screen to illustrate (in a Lord Privy Seal kinda manner). On the right-hand side was Abraham Lincoln. On the left-hand side was... Frederick Douglass.
Granted, it's hard to tell Stephen Douglas and Frederick Douglass apart. One was an ardent supporter of slavery who claimed that blacks were inferior to whites and that the Declaration of Independence's statement "all men are created equal" did not apply to them, whereas the other was a leading abolitionist and one-time vice-presidential candidate for the Equal Rights Party. But they're both dead.
Via This Modern World, which has a screen capture if you don't want to watch the video clip at Huffington Post.