Benjamin Ginsberg (born 1947) is a libertarian political scientist and professor at Johns Hopkins University who is notable for his criticism of American politics, in which he says that citizens have become "marginalized as political actors" and political parties weakened while state power has grown. His assessment of the futility of voting, along with his notion that the public has an illusion of control over government, has caused controversy. He is a co-author, along with Matthew Crenson, of Downsizing Democracy, 2004, which received critical attention in mainstream newspapers.