Useful Idiot (n)
A person who provides propaganda for and is used cynically by leaders of a cause or ideology, the goals of which are not fully known by the useful idiot.
And in the latest news, Obama has improved in the polls — 48% of Americans now approve of how he’s performing as president, (Gallup) despite the NSA mass surveillance, the invasion of illegals across the Mexican border, the IRS targeting of conservatives, the wait-till-death-for-an-appointment VA hospital scandal, the more-Americans-than-ever-before-on-food-stamps, the . . . .
See also “Are You a Useful Idiot?“
~Eowyn