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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...