General Keith Alexander said the NSA's surveillance programs have helped stop more than 50 potential strikes since the 9/11 attacks. At least 10 of them involved homeland-based threats. Bob Orr ... more 
General Keith Alexander said the NSA's surveillance programs have helped stop more than 50 potential strikes since the 9/11 attacks. At least 10 of them involved homeland-based threats. Bob Orr reports. less 
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Tue, Jun 18, 2013 8:59 PM EDT