An IQ test would be great but the ACLU would be all over it. I think a good start would be to restore the old voter registration system. Repeal motor voter, stop “buying” votes with registration drives offering sandwiches for the homeless, pop stars for the freshly eligible, etc. The dems pushed that legislation knowing full well it would be a veritable breeding ground for voter fraud.
I like Neal Bortz's idea: If you pay no taxes, you don't get to vote. If you pay $1-$10,000, one vote, $10,001-$20,000, two votes, and so on up to $50,000 and five votes. After that, it doesn't change. Clearly, the idea here is that those who foot the bills should have the largest say in the running of the country. It would also reduce the payback of buying votes with entitlements.
I would also start policing voter fraud, like Acorn pulled off in Lake County, Indiana where dead people not only voted, they voted twice! This Republic cannot endure a breakdown in the faith of the voting process, but we've seen that confidence eroded more and more since the "hanging chad" debacle in FL.