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Strong downdraft and close to the tornado and earlier than it normally would occur. >> he says think again. >> that's one of the key hang-ups in hitting the modification program. being able to demonstrate convincingly convincingly, both statistically and scientifically that what you intend would not have occurred naturally. >> reporter: what would have to be done to dissipate this? >> there is so much energy here it was thought the only approach would be to effectively drop a nuclear bomb inside it. that was actually given serious consideration in the early '50s. >> reporter: that never happen...

and all eyes now on the phrase "one nation" in the gop race to the white house. just ahead, new signs those words could be sarah palin is running for president. i'm wolf blitzer. you're in "the situation room." but first, a heartbreaking development in joplin, missouri. all week we've been bringing you wrenching stories of those missing in the tornado's wake, while at the same time holding out hope they might still be found alive. one of them, 16-year-old lance who was in his car when the twister hit has become a symbol of the desperation felt by so many families. i spoke to his mo...

We're going to quickly go to brianna keilar who's monitoring all this for us. brianna, again both sides are speaking. what's getting done? >> you know, well, obviously you're hearing two very different things, right? over the last few days, february, we've been hearing that negotiations are continuing, progress is being made, even though there isn't a deal. i think to really understand what's happening right now you need to know what some of the hang-ups have been in the last few days. you have the issue of spending cuts, yes. exactly how many billions of dollars for the rest of the budget yea...

Have is changed their tune completely. they did it overnight. staffs worked overnight. but we learned this morning that there are two big hang-ups. my question, i guess, is they have made the decision that's hard for me to comprehend. they have made the decision to shut down the government, because they want to make it harder, for example, for a woman to get a cancer screening. do they really want to shut down the government because the tea party doesn't want scientists to make sure the air we breathe is clean and pure? this is an extreme agenda that has nothing to do with a funding bill. this...

Problem? >> i'm sorry. could you repeat the question? >> sure. do you think that there's an understanding of the extent of the problem now? do you think people recognize what happened to carl and other children like carl that they acknowledge and understand what is taking place, how serious a problem this is? >> i think that you know, all schools need to have a collective response. and i think that the federal government, we've always looked to the federal government for leadership in voting rights and civil rights and we need to look to the federal government for leadership in the safety of o...