
In political jargon, the term useful idiot was used to describe Soviet sympathizers in Western countries and the attitude of the Soviet government towards them. The implication was that though the person in question naïvely thought themselves an ally of the Soviets or other Communists, they were actually held in contempt by them, and were being cynically used.
The term is now used more broadly to describe someone who is perceived to be manipulated by a political movement, terrorist group, hostile government, or business, whether or not the group is Communist in nature.
via Useful idiot – Wikipedia, the free encyclopedia.
Case in point: Joe The Plumber, “real america” and fox news


yep