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hooker scandal hits the hill. the first member of the obama administration getting grilled this hour on the colombian prostitution debacle. the white house saying their staff is in the clear. why do they have to testify? coverup. john edwards' former top aide coming clean admitting he helped cover up edwards affair with his mist res mistress, rielle hunter. has presidential politics moved from behind the podium to on the stage? "newsroom" begins right now. we begin with startling new developments in a missing child case that riveted much of the world nearly five years after mad...

it is deadly. the u.s. agriculture department announced that a case of mad cow disease has been confirmed -- confirmed in a dairy cow out in central california. let's bring in lisa sylvester. she's working this story for us. lisa, what is the department of agriculture saying. what's going on? >> reporter: wolf, the usda just released information within the last hour and what we know is that it is a dairy cow from central california that has tested positive for bse or commonly known or referred to as mad cow disease, and wolf, this is only the fourth case ever detected in the united s...