Several A-listers are banding together to beg President Barack Obama to keep his word about seeking a world [free] of nuclear weapons. Apparently, they've been cycling through the Superman movies to ready themselves for Man of Steel and stumbled upon Superman IV: The Quest for Peace. Actors Michael Douglas, Matt Damon, Naomi Watts, Morgan Freeman, Robert De Niro, Martin Sheen and Alec Baldwin, among others, appear in a new video for Global Zero urging the president to address the issue at next week’s G-8 summit.... Freeman and Sheen conclude, “For if we believe that the spread of nuclear weapons is...