In The Manchurian Candidate, the son of a prominent right-wing politician is captured by the Soviets and brainwashed in a secret Manchurian location. His task is to assassinate a presidential candidate, thus ensuring the election of the demagogic vice-president. Hence, the title "Manchurian Candidate."
The film has several parallels to current events. The main difference is that in those days, Americans had to be brainwashed into serving enemy interests by psy-ops teams. Nowadays, they come self-brainwashed with some indoctrinative assist from the American educational system.
In the film, a scary lady with leftist sympathies who looks vaguely like Hillary Clinton manipulates her husband into high political office. In real life, a scary lady with leftist leanings who looks vaguely like Angela Lansbury (only scarier) manipulates herself into high political office.