captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening, it has been an ominous and frightening afternoon in dallas fort worth. at least two tornadoes the weather service described as skipped across the metropolitan area of six million people. while damage is widespread, areas of severe damage appear to be limited. there are no immediate reports of fatalities but assessments are still coming in. we feared the worst when we saw pictures of semi trailers flying through the air but the twisters were selective. just a few neighborhoods are heavily damaged. a lot of what we've seen is broken glass and roof tops. we just talked to the mayor of arlington who told us that he knows of only a few injuries in his city. the mayor of lancaster reports a few injuries as well. d.f.w. airport did shut down. hundreds of flights have been canceled. jason allen of our cbs station ktvt has more from the scene. jason? >> reporter: i am standing on a concrete slab that used to be the wall of this door business in kennedydale. the three people who were inside when the tornado came through took refuge in a bathroom. the only part of the building that did not fall. it's just some of the damage spread today across north texas. the storm line rolled in early this afternoon and covered the entire dallas fort worth area. a tornado emergency was declared by the national weather service. >> that storm will be moving in your general direction so take shelter now. >> reporter: highway drivers watched as one of the twisters formed and reformed in front of their eyes. chunk of metal and wood were suspended in the air as the storms closed in. >> i have three infants with me, three kids with me, i put them in the bathtub, laid on top of them, put a cover across them and we prayed. >> reporter: stately homes in the dallas suburb of lancaster suffered significant damage. neighbors hugged each other in relief while others pointed out damage and lost landmarks. much of this footage of the on coming twister was shot on a camera phone. dawn h-pbder son and her fiancee road out the storm in the bathroom of their business. >> i was praying mighty heart bathroom. if this concrete wall had gone the other direction it would have crushed us because that's where we were, right there where that concrete wall fell. >> reporter: tractor-trailers weighing thousands of pounds were peeled open and thrown across this truck yard. one landed on top of what appears to be a car. others were thrown into trees bordering the lot. >> my first tornado. >> reporter: schools across the area were locked down and students sheltered in place. in arlington, the t *bgs texas rangers ran for cover in the mid-of a spring training workout. it's estimated 10,000 travelers will be stranded at the dallas fort worth airport tonight. all of this happened just in the last few hours. the damage is still being counted up. for example, scott, we just learned 110 planes were damaged at d.f.w. airport. >> pelley: a tough afternoon. jason, thanks. david bernard is our cbs news weather consultant. he's been tracking these storms today. david, what were the weather conditions that started all of this? >> reporter: scott, this was a typical springtime setup across north texas. we had very deep gulf moisture coming up from the south and a powerful area of low pressure coming out of the rockies that's actually producing snow there and the collision of those two air masses and classic spring setup, that's produced severe weather and the ingredients for the tornadoes we've seen across the dallas area. >> pelley: when we look at the video coming into the newsroom from d.f.w., one of the things that's apparent is the damage is pretty sporadic, it seems to be a little here and a little there. how does that happen? >> reporter: these tornadic stormstorms have r very tight circulations and they can also fall apart very quickly and often times with a tornado it doesn't stay on the ground consistently the whole time. that circulation with the tornado can weaken causing the tornado to lift and descend again as it strengthens in other areas that can lead to the damage where one house gets destroyed but maybe across the street we see hardly any damage at all. >> pelley: maybe a little bit of luck. david bernard, thanks very much. the other big story we've been following is that college shooting massacre in oakland, california. a former student is accused of killing seven people and wounding three others yesterday. john blackstone spoke with one of the survivors today. >> reporter: with an underwater robot and help from divers oakland police searched for a gun used to kill seven people. at the small campus of oikos university, investigators continued working the crime scene in rooms riddled with bullet holes. police radio calls show the suspected gunman was quickly identified. >> the shooter is going to be a male korean, about 40 years old, heavy build. >> reporter: the suspect is 43-year-old one goh, an american citizen born in korea. he was expelled from the university in january for behavioral problems police say he told them other students made fun of him because of his poor english. last year he lost two family members-- his mother and brother. investigators say he's being corporative but hasn't shown remorse. this oakland police spokesman says there's evidence the shooting was planned in advance. >> when the gunman entered the school he took a hostage he was looking for a specific when he entered the classroom he directed the students to line up against the wall. before they had a chance to do that he started shooting the students. >> reporter: in another classroom, dechen yangzom hid with other nursing students. >> it's pretty what i hear in the movie, you know? the bang, bang. >> reporter: that's frightening to hear right outside the door. >> so frightening. >> reporter: she locked the door and turned out the lights before the gunman reached their classroom. did the bullets come through the door? >> it did. three times. i can say three times it came in our class. >> reporter: three bullets? >> because the glass were all scattered in the class. >> but you saved everyone. >> just small things like locking, just lock ago door saved all of user wise i think he might kill all of us. >> reporter: dechen yangzom is being called a hero but she says she may find it difficult to return this building. the small campus of oikos university. scott, the accused shooter is scheduled to be arraigned in oakland tomorrow. >> pelley: in the presidential race now mitt romney hasn't sewn up the republican nomination but he's hoping to add a few more stitches tonight in the primaries in wisconsin, maryland and washington, d.c cbs news talked to voters as they left the polls and the national economy was on their minds. 83% said they believe romney will get the g.o.p. nomination. first chip reid with the romney campaign. chip? >> reporter: good evening, scott. mitt romney is leading in the polls here in wisconsin and if he does win tonight it will certainly cement his status as the republican front-runner. today in a milwaukee suburb an upbeat romney was handing out sandwiches at a sub shop. he then gave an optimistic assessment of his chances. >> if we have a good turnout i'll become the person who receives the wisconsin delegates i need to go on to become the tom knee and take back the white house. so... >> reporter: in a short speech romney repeatedly attacked president obama and that's what he wants to do on a full time basis. instead he's going state to state engaged in an increasingly nasty battle with rick santorum. a fight santorum says he plans to take all the way to the republican convention in august. >> pelley: chip, thank you. santorum is in his home state of pennsylvania tonight campaigning for the critical primary there in three weeks. dean reynolds is covering his campaign. dean? >> reporter: scott, it looks like a difficult evening for rick santorum, similar to what he's faced in other states. we asked him about that during a campaign stop in wisconsin. senator, in all these midwestern industrial states you start out ahead in the polls and then lose at the finish line. how do you break that pattern and why does it exist? >> i don't know, maybe $5 to $10 million running down negative ads driving downturnout might have something to do with. >> reporter: but that won't change. how do you break that patern? >> we're working at it. no one said this would be easy when you're going up against the money and the machine. the way tkpwo *erpl has been abe to win states is to drive downturnout by turning off voters and alienating people and getting historically low turnouts and winning in that fashion by running the overwhelmingly negative campai campaign. >> reporter: for santorum it's on to pennsylvania where the april 24 primary will be held and where polls show that santorum is holding a six-point lead over romney. scott, the same polling organization found santorum with a 14-point lead in mid-march. so his lead appears to be shrinking rapidly once again. >> pelley: thank you, dean, president obama weighed in today saying the republican party has swung so far to the right that ronald reagan could not win a g.o.p. primary this year. he made that claim during a speech in washington. chief white house correspondent norah o'donnell was there. norah? >> reporter: scott, president obama for the first time today directly attacked his likely opponent mitt romney. it was part of a stinging rebuke of the republican budget plan that the president called "social darwinism" that he said would only deepen income inequality in this country. >> i believes in make-or-break moment for the middle-class and i can't remember a time when the choice between competing visions of our future has been so unambiguously clear. >> reporter: the president signaled today he is ready for a fight, blasting mitt romney for embracing a controversial budget blueprint for the country that was designed by republicans in congress. >> he said he's very supportive of this new budget. and he even called it "marvelous." which is a word you don't often hear when it comes to describing a budget. >> reporter: the republican plan was authored by wisconsin congressman paul ryan, a romney supporter. it would repeal president obama's health care law, cut the top tax rate from 35% to 25% and cut spending by $5.3 trillion, including $810 billion from medicaid and $205 billion from medicare. president obama's own plan calls for increasing taxes on the wealthiest americans. and he says the g.o.p. plan would give millionaires a $150,000 tax cut. >> it is a trojan horse disguised as deficit reduction plans, it is really an attempt to impose a radical vision on our country. it is thinly veiled social darwinism. it is antithetical to our entire history as a land of opportunity and upward mobility for everybody who's willing to work for it. >> reporter: chip reid talked to congressman ryan in his home state today and ryan said mr. obama's attacks are an attempt to deflect from a failure to address the skyrocketing national debt. >> if we prevent a debt crisis from happening in this country-- which is what our plan does-- then we can protect the people who need government the most. that's people who have already retired, people on the bottom rung of the economic ladder who need safety nets. >> reporter: republicans also note that democrats in congress have failed to produce a budget for the past three years. scott, that means congress has been funding our country on an add hock basis and that is something that both sides agree is no way to govern. >> pelley: knorr, a thank you very much. there's another campaign in wisconsin. this one asking will the governor be recalled? former vice president dick cheney with a new heart goes home from the hospital. and a wildcats victory leads to wilding in kentucky when the "cbs evening news" continues. 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(laughter). >> reporter: phr-ft davis doesn't just get his kids to college, he keeps them there. andrew wan is one of davis' former students. like davis, wan enrolled in florida a&m university and joined the marching 100. when college got tough wan wanted out. >> he said it so simply "if you quit band now and you come back home, what are you going to do?" >> watch the conductor! >> reporter: guess what andrew wan does today? after graduating from fam u, he is standing in as band director at miramar high while alvin davis is on leave and tours schools across florida as the state's teacher of the year. >> when i look in the mirror i say "there's the american dream." raised on drugs and gang-infested streets on the south side of chicago and i'm one of four finalists for national teacher of the year. >> reporter: what touches your heart more? to know you've been recognized by the state and nation as an educator or that some of your kids call you daddy davis. >> kids call me daddy davis and i can tell you what touches my heart even more, when i get a kid that comes up four years after high school graduation, "mr. davis, here's my college diploma." (laughs) sorry. got me. >> reporter: over the past 12 years teaching, alvin davis has shed plenty of tears because he's seen plenty of his kids succeed. byron pitts, cbs news, miramar, florida. >> pelley: as mr. davis mentioned, he's one of four national teacher of the year finalists. the winner will be announced later this month and honored by president obama. that's the "cbs evening news" for tonight. for all of us at cbs news all around the world, good night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org this 19news now. >> tonight it is the megamillion dollar question on everyone's mind. is that woman who claims to be the winner of the $646 million jackpot carrying off a hoax or is that single mom of seven from baltimore really richer than our wildest dreams? scott has the latest. >> reporter: media scorned by a single mother of seven that says she won the megamillions, but can't get the story straight about whether she even holds the ticket. >> you have it yourself? >> are you sure you have it? >> i was