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It appears to me that the issue is whether or not it's a sign to promote something. or whether or not -- is there any limitation of what they can put on this piece of art? can they say we hate all of a certain ethnic group? >> no, there's no limitation of what they can put on it if it's a political statement. if it's offering something for sale, then the city can regulate it. that's why you don't see billboards there. billboards offering something for sale. but a billboard that says, "protect life" or a billboard says president obama is a great guy, those types of billboards would be protected...

But the results of this would destroy systems that we depend on. we don't have much food it stockpiled. we don't have water stockpiled at all for most people it comes out of pipes. air conditioning, heating, you can see the problem. >> tucker: that's horrifying possibility. how are we protecting against that happening? >> we're not. there's been a commission that congress authorized starting in 2001, they've been writing reports on it. the electrical industry has been studying some ways to harden systems, but we are really not protected and nobody has done an experiment -- the last time this k...