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breaking public health scare. a confirmed case of mad cow disease in california has the agriculture department here in washington on full alert. the fatal brain disease not only can be passed among cattle, scientists think an equally deadly variation can be transmitted to humans who eat contaminated beef or dairy products. the first confirmed case here in the united states in six years. elizabeth cohen joins us from the cnn center in atlanta. elizabeth, one of the reasons people get so scared is the potential. what does this mean for the food supply? >> you know, for this one cow tha...

northeast are desperate to escape the flooding and the damage unleashed by hurricane irene. we're tracking the rescues and the danger right now. and we'll put the arrest of the uncle in a dui charge. this hour, and whether they matter to most american. i'm wolf blitzer and you're in the situation room. up first this hour, a very tough political debate over national security that will unfold between president obama and his republican challenger, whoever that might be. the commander in chief dep and it's no coincidence that war and foreign policy are getting more attention on the campa...

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