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As "jamiso" has rightly pointed out, US citizens were dumb enough to vote GW Bush for President in 2004 (given that there is some doubt that he was actually elected in 2000).
AND - these very same US citizens have not yet all those impeachable in the GW Bush Gang of War Criminals, have not thrown them out of power and into jail...
US citizens have certainly demonstrated outstanding levels of "dumbness".
Are they "too dumb to vote"?
Well, it is known that US citizens - along with the citizens of most nations, including India where I come from - don't really vote in 'democratic elections' with their rational brains, and this is what enables gangsters like GW Bush to take control of the polity.
-- GSC