Big_E, do you have any idea how those "literacy" tests worked? They weren't "literacy tests" in the traditional/literal sense. They were constitutional "literacy" tests; someone from England (a native speaker of English) would fail miserably unless he knew the US Constitution pretty well.
They weren't "If you score above X, you can vote." After they were submitted, the tests were reviewed behind closed doors, and approval was arbitrary. So, if a man named black man scored a 100%, he could still be denied by the panel, and a white man who only got 25% could be approved.
Here is a link to a 1965 Alabama literacy test. A lot of it is pretty common knowledge, but there are some tricky questions in there I'm willing to wager not too many people know the answer to. And also, it didn't really matter too much what you got because of that whole behind-closed-doors panel approval process.
And as far as your comment about such a large portion of the black population voting for Obama, you're really overstating it. Democrats
always carry the black vote by a huge amount; John Kerry got 88% of the black vote in 2004, and he's whiter than I am. (And I'm pretty damn white.) Washington DC, which is ~60% black, almost never gives more than 10% of the vote to Republican presidential candidates. Black people are just a demographic the Republicans stopped going after after Nixon's Souther Strategy. Also keep in mind that a pretty big portion of white people (43%) voted for Obama. Are you implying they're "illiterate" as well? Or that 62% of Asians voted for him? (And if we're operating off stereotypes, since you obviously are, they are the smartest ones out there, you know.)
