This week, President Obama signed the biggest nuclear arms reduction pact in a generation and released his Nuclear Posture Review. The response from the right was as bellicose as it was predictable. Among the most vocal critics were Sarah Palin and Rudy Giuliani. Can Palin also see Russia's missiles from her porch? Giuliani derided the idea of a nuclear-free world as "a 60-year dream of the left." The problem for him and all the other kneejerk critics is that this is a dream shared by that unrepentant lefty, Ronald Reagan, who wrote in his memoirs: "I never let my dream of a nuclear-free world fade from my mind." Reducing -- and ultimately eliminating -- nuclear weapons is not a right versus left issue. It is a sanity versus insanity issue.