An exclusive story from the Wall Street Journal says that cyberspies have penetrated the U.S. electrical grid and left behind software programs that could be used to disrupt the system. In eerie echoes of the Cold War, government officials are blaming China and Russia, but is nearly impossible to know whether or not this act is government-sponsored because of the difficulty in tracking true identities in cyberspace. The spooks were believed to be on a mission to navigate the U.S. electrical system and its controls. And while the intruders haven't damaged the power grid, officials warned they could. For more on this startling story, we turn to the Wall Street Journal's Intelligence Correspondent Siobhan Gorman.