crushed by tornado debris. the question is would they be alive if that school had a storm shelter? they didn t have anywhere to go other than an interior room. could the city, the state, or the federal government have done something to prevent the magnitude of this tragedy? those are key questions as president obama prepares to visit the storm ravaged area sunday. today secretary of homeland security janet napolitano was there. the death toll stands at 24 from the tornado. john king is in moore, oklahoma, tonight where he got a tour of the rubble left behind plaza towers elementary school. john, that key question, people seem to be asking, parents we re going to hear if later on tonight is could the deaths at that school have been prevented? erin, it certainly is a fair question. when you walk through that school, i don t care if you re a journalist, you being a parent of any kind, you re stunned at the devastation. the school was shaped like a u. most of the two legs a