good evening on this sunday night. the countdown is on until the crucial florida primary. at stake, the biggest prize so far for the republican candidates. take a look at the latest numbers. mitt romney pulling ahead if a two-man race surging 15 points ahead of newt gingrich there and in these fast-paced final hours both gingrich and romney are in full-out attack and begin with jonathan karl in orlando. >> reporter: newt gingrich may be sliding in the polls here, but he attracted an overflow crowd today at the village's town center in central florida. gingrich is trying to climb back with some of his harshest words yet for mitt romney. >> and i believe the republican party will not nominate a pro-abortion, pro-gun control, pro-tax increase moderate from massachusetts, and i think they will not nominate somebody who raises millions from wall street to run ads that are false. >> reporter: for his part romney campaigning in naples today essentially called gingrich a sore loser. >> he's not on tv this morning going from station to station complaining about what he thinks were the reasons he's had difficulty here in florida. i think for each of us, if we fail somewhere, if we fail in a debate or we fail to get the support of people, it's time to look in the mirror. >> reporter: but the story of this campaign in florida is largely a story of big money and nasty ads. it started with romney who launched this -- >> newt has a ton of baggage. >> reporter: his first attack ad in florida less than 48 hours after losing the primary in south carolina. since then romney and a pro-romney super pac have pummeled gingrich with nearly $14 million worth of attack ads in florida. most recently the controversial ad featuring tom brokaw. >> newt gingrich came to power after all preaching a higher standard in american politics. >> reporter: nbc wants that ad pulled down, but the romney campaign has refused. all told, romney and his supporters have spent more than four times as much on television ads in florida as gingrich and his supporters. >> that is pretty clear if you look at the volume of ads, i have an opponent who has money power, and we need people power to offset money power. >> surprise, surprise. >> reporter: last night gingrich won an endorsement from herman cain that he hopes will bring him some of that people power. herman cain will be out campaigning with gingrich tomorrow but one of gingrich's biggest problems, one of the real factors in his sliding poll numbers is a lack of support among women. in the latest poll out today, romney has a 21-point lead over gingrich among republican women in florida. david? >> all right, jon karl, see you in florida tomorrow. i want to bring in rick klein and, rick, while the florida polling shows romney pulling way ahead we did hear newt gingrich on abc's "this week" saying he is still ahead in national polling and makes this argument. i'd love your reaction. >> we tried in 1996 and he lost, we tried a moderate in 2008, he lost. hard to take romney care and obama care and have a debate and have the republican win that debate. you need to have a conservative who is a very big distance away from obama because you've got to have the space so that, in fact, you can communicate with the american people. >> rick, you literally have a candidate drawing the battle lines beyond florida. how important is florida, firsthand, and is newt gingrich already getting ready for what's beyond it. >> florida is critical. the most important state right now for mitt romney but it is turning against newt gingrich and it's happening pretty quickly. he notes that mitt romney is stronger in some of the states that follow but the only reason that any of this is happening is this relentless, vicious attack by romney on gingrich. so here is the critical thing to know about this week. the republican party is actually poised to take a big step tow d towards settling on a nominee but is taking a big step backwards when it comes to being happy with that nominee. there is serious bad blood that could make the primary fight last a lot longer even as romney looks stronger than ever. >> a lot of questions about these attacks going back and forth between romney and gingrich and whether or not they'll hurt the republican nominee in the eventual race against the president. >> that's right. a lot of the same arguments that president obama is poised to use in the fall are getting aired out right now. the conventional wisdom around this, these things don't hurt until they start to really hurt and that's the problem right now is that if we have an extended primary campaign where both sides, the establishment and anti-establishment side is going after each other it is a problem. >> rick klein, thank you. republican candidate rick santorum meanwhile, is far from florida back home in pennsylvania tonight at the hospital bedside of his youngest daughter bella. as david kerley tells us it is just the latest health scare for her and her parents. >> reporter: 3-year-old bella has already defied the odds surviving with a genetic disorder that kills most children before their first birthday. >> it's stressful. >> reporter: in november riding between campaign events santorum told us this is what he feared. >> we're dealing with a girl who has a cold killer. >> reporter: the santorum campaign made a video and the former senator has talked openly and emotionally about his seventh and youngest child. >> they told us that she had a fatal condition and was going to die. she had a condition called trisomy 18, which is like down syndrome. >> reporter: the santorums took bella home and have had their scares. >> i was the guy that held everything together, and it was a lie. it was a lie. i decided that the best thing i could do was to treat her differently and not love her like i did because it wouldn't hurt as much if i lost her. >> reporter: with santorum in philadelphia with bella, daughter elizabeth filled in at florida campaign events today. >> right now family comes first. being a dad and being a husband right now. >> reporter: daughters say pneumonia for a child with her condition is serious. >> an infection particularly if it gets set in can sometimes move faster than it would in someone else. ♪ >> look at that. the love that she emits and it's clear to me that we're the disabled ones, not her. she's got it right. >> reporter: so when will santorum return to the campaign trail? his daughter elizabeth at those florida campaign stops today said he will be back as soon as he can. but, david, rick santorum is trailing a distant third in the latest polls out of florida. >> all right, david kerley tonight from our washington bure low, david, thank you. back in florida tonight, police are meanwhile, investigating a string of fiery highway crashes in the early morning hours today that took a deadly toll on a busy interstate there. at least ten people were killed and 18 injured when cars and trucks slammed into each other on both sides of interstate 75 near gainesville. tonight the focus is on haze and smoke so thick the drivers were blinded. here's abc's mohamed lila. >> reporter: witnesses say it looked like a war zone. burned out rigs, cars crumpled and a mass of twisted, mangled metal. it happened around 4:00 a.m., the debris scattering along a mile-long stretch of i-75. by the time emergency crews survived the only way they could find victims was to listen for their screams. the blinding fix of fog and spoke from a nearby brush fire making it impossible to see. >> the visibility was reported to be near zero at the time. i mean you're not going to be able to see the car in front of you even if they're five feet in front of you. >> reporter: fog-related collisions is among the most deadly. just last month one in new orleans left two people dead and 2 hurt. what should you do if you're stuck driving in very low visibility? experts say the first thing to do is to slow down. number two, if you do have to stop make sure you pull over as far off the side of the highway as you can. and, number three, no matter what you do, never stop in moving traffic. in florida, today, police had originally closed the highway because of low visibility but decided to re-open it a few hours later. that's when the collisions occurred. meteorologist jeff smith of wabc says it's a reminder of how quickly conditions can change. >> it was really a perfect storm to cause reduced visibility. you had smoke from the wildfires, which puts particles in the atmosphere and just enough moisture for water to condense around it and cause fog. >> reporter: several remain in serious condition and hospital officials say the death toll could rise. muhammad lila, abc news. >> we'll turn overseas to iran's nuclear program under an intense mike scone. top weapon inspectors have arrived for a three-day tour of nuclear facilities and as tensions rice tehran is preparing to cut off crude oil sales warning that that could send oil prices upward. meantime, in syria tonight it's been a day of spiraling violence there with the death toll climbing as the syrian military moves in. anti-government protesters would took to the streets were met by troops and tanks trying to crush the latest uprising. at least 100 people have been killed in the fierce weekend battles there. tonight we're getting our clearest view yet from underwater nearly two weeks after that cruise ship ran aground as diving teams face another huge hurdle. here's abc's jeffrey kofman now. >> reporter: the image mas show a modern-day "titanic" dishes caught in a net on the sea bottom mattresses, clothes, even a black shoe. haunting new pictures captured by divers searching the sunken cruise ship "costa concordia" which capsized more than two weeks ago off the coast of italy. with 17 dead and 16 still missing, including a couple from minnesota, the day recovery operations were suspended because of bad weather. the situation is different in different parts, says this italian police diver. some points are not accessible especially where the ship is on the rocks. the immediate focus is on the environment removing half a million gallons of diesel fuel from the ship's tanks before it leaks out and today sobering news about the salvage operation, it may take ten months to remove the stricken ship from the island that doomed it. jeffrey kofman, abc news, london. back in this country tonight and to wall street where all eyes will be on eye-popping numbers as facebook goes public. the company preparing for the first time to sell shares and trish regan, trish, always great to have you on the broadcast. >> good evening. >> you've been digging into the numbers. really something. >> we're talking about a company that could be worth as much as $100 billion and just to put that in perspective, it would make it almost as large as company like mcdonald's. you have about 1,000 facebook employees out there who own shares in the company. they'll become millionaires basically overnight and you've got the founder, let's not forget about mark zuckerberg who will become the 23rd richest person on the planet, 27 years old. he will be worth about $20 billion. >> not bad, 23rd richest but are to the average american investor all of us watching our 401(k)s, the dow up 442 points on the year, great so far but you say this week ahead will be a real test. >> because we have a lot of information coming forward on the economy. watch for consumer confidence and spending and reports on manufacturing and watch for the all-important jobs report. it's a read on unemployment comes out later this week. >> all right, we know you'll be watching too, trish, thanks very much. the protests against wall street making headlines out west tonight, police in oakland, california, are trying to prevent a repeat of violent outbursts by occupy protesters there. almost 400 demonstrators were arrested in clashes with police late saturday and dozens of people broke into city hall burring an american flag and vandalizing the building smashing glass and spray minuting graffiti. next to a major mix-up by a college, an error that dashed the hopes of dozens. vassar college mistakenly told 76 early decision hopefuls that they had been accepted. the students saw the wrong letter when they logged on to a special website. hours later they learned the real decision was no in new messages from the school that had been then corrected. incredible. thousand to a picture that caught our eye. it was a charming tribute in calcutta, india, boy after boy dressing up as mow hat mcgann di, 485 boys in all with the mustache and wire rim glasses who died 64 years ago tomorrow. they hope to promote peaceful protests and set a guinness world record with those glasses, mustaches and smiles there. still much more ahead on "world news" this sunday night. we all get our blood pressure taken in one arm. why you should ask the doctor about the other arm. what it could reveal. the tribute that brought listeners to their feet. one new and memorable version of "at last" as we remember etta james. later tonight, the new super bowl ads that are super smart trying to get you to point your smartphone right at the tv and these dogs hoping you'll name their tune. i remember the day my doctor told me i have an irregular heartbeat, and that it put me at 5-times greater risk of a stroke. i was worried. i worried about my wife, and my family. bill has the most common type of atrial fibrillation, or afib. it's not caused by a heart valve problem. he was taking warfarin, but i've put him on pradaxa instead. in a clinical trial, pradaxa 150 mgs reduced stroke risk 35% more than warfarin without the need for regular blood tests. i sure was glad to hear that. pradaxa can cause serious, sometimes fatal, bleeding. don't take pradaxa if you have abnormal bleeding, and seek immediate medical care for unexpected signs of bleeding, like unusual bruising. pradaxa may increase your bleeding risk if you're 75 or older, have a bleeding condition like stomach ulcers, or take aspirin, nsaids, or bloodthinners, or if you have kidney problems, especially if you take certain medicines. tell your doctor about all medicines you take, any planned medical or dental procedures, and don't stop taking pradaxa without your doctor's approval, as stopping may increase your stroke risk. other side effects include indigestion, stomach pain, upset, or burning. pradaxa is progress. if you have afib not caused by a heart valve problem, ask your doctor if you can reduce your risk of stroke with pradaxa. let me get you a free tank of gas -- how's that sound? progressive saved me money, and i'm saving you money. [ chuckles ] now these guys are protected with progressive. come on around. we'll fill up your tank for you. free gas! 5 more inches. now you're lined up for some free gas and savings, eh? [ horn honks ] hey, we're trying to save here. i came in for this. yeah, fill it up, too. thank you. don't thank me. i'm just the messenger. i have a cold. and i took nyquil, but i'm still stubbed up. [ male announcer ] sorry buddy. truth is, nyquil doesn't un-stuff your nose. what? it doesn't have a decongestant. really? [ male announcer ] you need a more complete cold and flu formula, like alka-seltzer plus liquid gels. it's specially formulated to fight your worst cold and flu symptoms, plus relieve your stuffy nose. [ deep breath ] thank you! [ male announcer ] you're welcome. that's the cold truth! [ male announcer ] and to fight your allergy symptoms fast, try new alka-seltzer plus allergy. we're going to turn now to healthy living tonight. in an extremely simple test that could find a silent killer. we all get our blood pressure taken when we go to the doctor but a new study finds that checking the pressure in both arms could actually make a huge difference. here's tanya rivero. >> reporter: cardiologist oscar garfein has long been an advocate of taking a blood pressure reading from both arms, and it saved the life of one of his patients. >> i found out in one arm it was very, very low and the other one, it was normal, and it helped me arrive at a diagnosis of a potentially lethal condition. >> reporter: so he was not at all surprised by the study released today finding a difference in blood pressure between the left and right arm can be a sign of heart disease. the lancet study found the difference in the systolic number, that top number, of more than 15 can indicate a narrowing of arteries to the legs, decreased blood flow to the brain, heart disease and a 70% increase in your chances of dying from either heart attack or stroke. >> you want to search for the risk factors that are associated with this such as high blood pressure or cigarette smoking or high cholesterol and treat them very aggressively. >> reporter: i had dr. garfein take my blood pressure from both arms. little difference. >> pretty good to me. >> reporter: many cardiologists routinely check blood pressure in both arms. the practice is much less common on a routine doctor's visit. this study confirms a double reading could flag an underlying vascular problem on a seemingly healthy person. >> all it takes is about one minute, and you can find something that really most of the time points to the fact that this patient has established vascular disease. >> doctors say they hope everyone asks their doctor, nurse, technician, whoever it is that takes their blood pressure on the next visit or checkup to take it from both arms. it only takes a minute, david, and it can give you such important information about your health. >> and as we saw there that doctor didn't mind taking the extra 30 seconds to check your arm. >> he says he does it on every visit, all his patients. >> and are there other tests that would show the same thing or is this the simplest thing to show it? >> there are other tests, but none as cheap and easy as this one. >> who knew, tanya. check both arms next time. thank you. that beautiful song "at last" in honor of etta james. of up to 10 independent research providers into a single score that's weighted based on how accurate they've been in the past. i'm howard spielberg of fidelity investments. the equity summary score is one more innovative reason serious investors are choosing fidelity. get 200 free trades today and explore your next investing idea. for many, nexium helps relieve heartburn symptoms caused by acid reflux disease. osteoporosis-related bone fractures and low magnesium levels have been seen with nexium. possible side effects include headache, diarrhea, and abdominal pain. other serious stomach conditions may still exist. talk to your doctor about nexium. then i found new pronutrients omega-3. it's from centrum. it's a smaller minigel. with two of the best omegas to support my heart, brain and eyes. new pronutrients from centrum. that's how it is with alzheimer's disease. she needs help from me. and her medication. the exelon patch -- it releases medication continuously for twenty-four hours. she uses one exelon patch daily for the treatment of mild to moderate alzheimer's symptoms. [ female announcer ] it cannot change the course of the disease. hospitalization and rarely death have been reported in patients who wore more than one patch at a time. the most common side effects of exelon patch are nausea, vomiting, and diarrhea. the likelihood and severity of these side effects may increase as the dose increases. patients may experience loss of appetite or weight. patients who weigh less than 110 pounds may experience more side effects. people at risk for stomach ulcers who take certain other medicines should talk to their doctor because serious stomach problems such as bleeding may worsen. people with certain heart conditions may experience slow heart rate. [ woman ] whenever i needed her, she was there for me. now i'm here for her. [ female announcer ] ask the doctor about your loved one trying the exelon patch. visit exelonpatch.com to learn more. legendary rhythm and blues star etta james was bid farewell in california this week including this rendition of her beautiful song by christina aguilera ♪ ♪ >> etta james, as you know, died last week, and in the week after her passing, fans bought 30,000 copies of her album, one of them rising to number 46, her highest charting album ever. and another soul standard burning up the charts this week thanks to that presidential performance. ♪ i am so in love with you [ cheers and applause ] >> you might have seen the president crooning a line from al green's "let's tay together" at a recent fund-raiser. well, sales of classic have spiked 490% with 16,000 downloads in just a week's time. and we had basketball on tonight. there was big news in the tennis world. the tennis season getting off to an epic start at the australian open. novak djokovic outlasting rafael nadal in a men's final that went a record 5:53 ending near 2:00 a.m. a euphoric djokovic tearing off his shirt in triumph there but during the exhaustive thank-yous, the crew had to bring out chairs for the two players who could barely stand up. that's really something. when we come back here tonight, a preview of the super bowl ads that are still a week away, and this year there are three different things we have to watch out for. a wife, i'm a . and chantix worked for me. it's a medication i could take and still smoke, while it built up in my system. [ male announcer ] along with support, chantix is proven to help people quit smoking. it reduces the urge to smoke. some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. if you notice any of these, stop taking chantix and call your doctor right away. tell your doctor about any history of depression or other mental health problems, which could get worse while taking chantix. don't take chantix if you've had a serious allergic or skin reaction to it. if you develop these, stop taking chantix and see your doctor right away as some can be life-threatening. if you have a history of heart or blood vessel problems, tell your doctor if you have new or worse symptoms. get medical help right away if you have symptoms of a heart attack. use caution when driving or operating machinery. common side effects include nausea, trouble sleeping and unusual dreams. my inspiration for quitting were my sons. they were my little cheering squad. [ laughs ] [ male announcer ] ask your doctor if chantix is right for you. [ male announcer ] ask your doctor if chantix whee wheeeeeeeeeeeee! wheeeeeeeeeeee! whee whee wheeeeeeeeeeee-he-he-heeeeee! whee whee wheeeeeeeeeeee! pure adrenaline. whee whee wheeeeeeeeeeee! everything you love about geico, now mobile. download the new geico app today. whee wheeeeeeeeeeee-he-he-heeeeee! but i'm an on the go woman. i've been active all my life. that's why i'm excited about reclast. it's the once-a-year iv osteoporosis treatment. reclast helps to restrengthen my bones to help make them resistant to fracture. and with reclast, well, no other osteoporosis treatment is approved to help protect in more places: hips, spine, even other bones. [ male announcer ] you should not take reclast if you're on zometa, have low blood calcium, or kidney problems. or you're pregnant, plan to become pregnant or are nursing. take calcium and vitamin d daily. tell your doctor if you develop severe muscle, bone or joint pain, if you have dental problems as jaw bone problems have been reported, or if you develop new or unusual pain in your hip, groin or thigh. the most common side effects include flu-like symptoms, fever, muscle or joint pain, headache, nausea, vomiting and diarrhea. if you have questions about your current treatment, ask your doctor about reclast. finally tonight here, the countdown is on. we're just one week away from the super bowl now, and as is the case every year, we get a preview of the super bowl ads, but tonight three things that are different about them this year. those ads trying to reach right into your living room and make you reach for your smartphone. [ dogs barking ] >> reporter: one of the first big changes here, the super bowl ads coming out long before the game even begins. volkswagen's minute-long teaser of a canine chorus performing the darth vader theme. [ dogs barking ] >> reporter: shoe company skechers hoping to run away with this ad competition. >> is he wearing running shoes? >> it is legal, i believe. >> reporter: even before the game. the second big change in ads this year, many of them will be much longer. there's a one-minute ad from audi celebrating its l.e.d. headlight technology. she's only bad news if you're a vampire. lastly, the ads this year will try to reach out to your technology because it's estimated 60% of viewers will have a second screen right in their hand, their smartphone. this ad has that pattern in the box. it's called a quick response code. viewers can hold their smartphones right up to the tv. it will take their smartphone right to the advertiser's website. >> relax, muchacho. this you new phone i got will get us anything we want. >> send me more doritos. >> reporter: and doritos hopes to cash in on this too having some fun with the smartphone query who helps you find things. >> send me three hot, wild girls. >> sending three rottweilers. >> no, hot, wild girls. hot, wild girls. >> we'd thought we'd leave you with a smile tonight. that is "world news" for this sunday. thanks for being this weekend. "good morning america" first thing in the morning and diane sawyer right here tomorrow night. have a good evening. good night. it began as a peaceful march and quickly deteriorated into clashes with police. tonight the damage after yesterday's "occupy oakland" march. >> more than 400 people were arrested in last night's clashes that were punk waited by rock and bottle throwing protesters met by volleys of tear bass. >> tonight the cleanup is just beginning. >> this core gated mellal shield was taken from a demonstrate 'er. its part of a line of shields used. oakland police say they have never seen this kind of coordinated hostility. hundreds of people were arrested after several orders to disspeakers. >> we have arrested from city hall and arrests from the ymca, as well as arrests tt