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malibu triathlon in september. let's get started. >> we'll get to the fit nation lucky seven in just a moment. first, we have big medical headlines to get to. an hiv test you can do by yourself as home just got unanimous backing from an fda advisory panel. you get results in 20 minutes, and if approved it will be in drugstores over the counter. the thinking is quite simple, so more people will be tested if they can do it in the privacy of their own homes. >> if you're at home by yourself, at home with loved ones and the test comes up positive, you have to prepared what you're going t...

it's the conservative political action conference in washington, d.c. i've got you there live right now. this is the vamp up, folks, to the big delegate leader, mitt romney. if you want to be the republican nominee for president, you'd better have your game face on when you come to cpac. and you better have cpac on your side, some say. there is a caveat to that. i'll get to that in a moment. any second now, as i said, we're expecting mitt romney, who's going to make his case from that podium to this audience. a critical audience. core conservatives in that audience. and the message h...

repeated blows to the head, the kind that you get on a football field can have lasting reprecussions. especially for young people. some states are writing new laws. in fact, one just took effect this month here in california. any player on a high school or middle school team who gets a concussion must be cleared by a trainer or doctor before going back on the field. even then, though, the risk is hard to gauge. you can't really see damage to the brain unless you actually look inside. of course, by then it's too late. >> reporter: football is a violent game, full of big hits. what are...

at for more than a year now. growing evidence repeated blows to the head, the kind you get on the football field can have lasting rep recushions. a law take effect in california. a player who gets a concussion must be cleared by a trainer or doctor before going back on the field. the risk is hard to gauge. you can't see damage to the brain unless you actually look inside. of course by then, it's too late. football is a violent game, full of big hits. what are all those collisions doing to the brain inside the helmets? i met with kevin, he's a researcher from the university of north c...

i want to start with peter hanby in charleston, south carolina. talk to me about the romney camp managing the expectations going into tomorrow's primary. >> yes, after a week ago when they were up for ten points in the poll, they aare bracing fora second-place finish here which is not expected. last night, romney said it is a four-person race and we never expected to win here, and sure we could lose, but we will go down to florida to where we have a organization and a lot of support. and today, he told reporters that it was an uphill battle here, and echoing the line, and look, the r...