Very political late-night on CBS. While David Letterman hosted President Barack Obama, Late Late Show host James Corden hosted former California Gov. Arnold Schwarzenegger and they re-enacted 17 of his films in six minutes. After kicking things off with Conan The Barbarian, they worked their way through to The Expendables, where Arnold asked, “One, two or three?” and James correctly wondered, “What’s the difference?” Schwarzenegger had no answer: “I don’t know, I never…