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The Obama administration, like the Bush team before it, have talked a great deal about the need to strengthen our ability to fend off attacks that target U.S. computers. How much should we worry, really?

Yesterday we heard from James Lewis at the Center for Strategic and International Studies. He's just written a new report that concludes there is no chance another country or terrorist group will launch a major cyber attack against the U.S. anytime in the near future. Still, Lewis believes U.S. defenses against an Internet-based attack on its military and government computers, power grids and financial system are weak and need to be shored up to guard against future threats.