Conditional Suffrage?

[CORed]

In theory, I don't think some kind of qualification to vote is a terrible idea, whether it's some sort of test of intelligence, general knowledge, or even what Heinlein suggested in Starship Troopers, limitng the vote to people who had served in the military (under which I would not be qualified, btw). In practice, I think such a system could be easily manipulated, as the "literacy tests" in the southen states were to exclude black people from voting. Also, I think there is nearly zero chance of it ever happening in this country, because democracy and universal adult suffrage have become such sacred cows, even though the Founding Fathers considered it something to be feared.