What you should know. And the power couple who hit the jackpot, half a billion times over. Nightly news begins right now. From nbc news World Headquarters in new york, this the nbc nightly news with lester holt. Good evening. A Surprising Development in the race for president leads our news tonight. A brand new nbc news wall street journal poll shows donald trump has slipped from the top spot nationally falling behind ted cruz among republican primary voters. Our poll has cruz now ahead at 28 with trump at 26 and marco rubio rounding out the top three at 17 . Trumps tumble from the top spot comes as he and cruz trade threats, dares and accusations ahead of saturdays South Carolina primary where trump still leads. Nbcs Hallie Jackson has late details. Reporter tonight a stunning new national frontrunner, ted cruz. Its tremendously encouraging to be leading the field nationally. I think as a result reporter did you ever think youd be here . That was always the plan. Look, thats how you win. Got to get to first place to win. Reporter its a 15point flip from last month, trump slipping seven points and cruz up eight. After the iowa caucuses, the New Hampshire primary and saturday nights debate. Republican voters have taken a pause deciding whether or not they want to nominate donald trump to be president. Reporter as cruz heats up, hes burning it down in South Carolina with a scorched earth news conference. File a lawsuit. Reporter daring donald trump to sue him over this ad. Well, im very pro choice. Reporter trump wants cruz to stop airing the spot pointing to his current prolife stance. Trump supporters have shown a great likelihood of forgiving him for positions like that. Reporter cruz insists hell put the ad on tv more often now, even as trump doubled down on ive had Great Success in business. Ive had Great Success with lawsuits, and i dont know that were going to have a lawsuit but we certainly want to keep somebody honest. Reporter taunting cruz, saying time will tell, teddy. Trump is again calling him a liar, their political bromance dead. You hugged him for months and months and months and those who say you and your support of donald trump at that time has allowed him to be where he is today and to be in the position to talk about this stuff. Oh, listen, hallie, as i said at a time. Theres a time and season for campaign for policy differentiations snow hauls knew this moment was coming . Of course it was headed to this. Reporter in South Carolina its trump who is still dominating in the polls. Cruz, trailing him, marco rubio close behind and closing in. Late tonight pick up a new endorsement from South Carolinas popular governor. Thank you. Reporter rubio wasnt the only one looking for nikki haleys support. Jeb bush was, too, but our new polls hypothetical headtohead kasich would lose to donald trump. Only cruz and rubio would beat him. Lester . Hallie jackson, thank you. Im joined now by chuck todd, our political director and moderator of meet the press. Chuck, theres been broad consensus if trump wins South Carolina he would have a clear path to the nomination. Do these new National Poll numbers suggest things wont be reporter i think what you see here with our new numbers is this, lester. Is that weve always told you months. Donald trump has a low ceiling but a high floor meaning hes never going to drop too low, but he always seems to struggle as the field shrinks to get over that 50 mark, and what our polls show on this is that as this field has shrunk, the smallest need weve tested in the last six months, weve seen trump doesnt grow, everybody else does, so this is a flashing yellow light for donald trump, even if he wins South Carolina. Hes going to have problems down the road as the field winnows. Chuck todd tonight, thank you. At a town hall event tonight at 8 00 eastern and pacific only on msnbc. Things are rapidly changing in the democratic race, too, where Hillary Clintons once Comfortable Lead in nevada has all but evaporated, now a virtual dead heat with Bernie Sanders ahead of saturdays vote and now with what looks like a long road ahead of them to the nomination sanders and clinton are increasingly focused on securing the black vote. Nbcs Kristen Welker has more. There is something wrong, my friend. Reporter secretary clinton is ramping up her outreach to black voters on the south side of chicago today, vowing to reform the criminal justice system. To make sure that no other young woman like sandra bland is ever pulled out of a car for no good reason and thrown into a jail where she is found dead. Reporter Sandra Blands mother by her side less than a year after her daughter was found dead in a texas jail, this as a new poll shows clinton and nevada, her doubledigit lead in october evaporating to a single point. Reporter senator sanders, who is struggling to win over minorities, making his case at a rally in atlanta last night, but the headlines came from sanders surrogate, rapper killer mike quoting educator and activist jane elliott. Jane said michael, a uterus doesnt qualify you to be president of the united states. Reporter those comments sparking a backlash on twitter, privacy advocates say they will help build the order. If we build a back door or master key into the lock you cant control that only good guys are going to use it and bad guys cant use it. Reporter after months of saying it cannot get into a locked phone apple now says it should not be forced to do so. In a letter to customers ceo tim cook says if apple creates the software and it fell into the wrong hands it would unlock any iphone, a blow to customers who rely on Companies Like apple to protect their data. They do business all over the world, and if they give this kind of access to the u. S. Government, they may have to give it to the russians. Chinese, and apple simply doesnt want to do that. Reporter this proifsy versus security showdown comes against the backdrop of an act of terrorism. The husband of one of those killed in the San Bernardino shootings says apple is wrong. Im very upset at apple not assisting the federal government. Peoples lives matter. Reporter new york citys commissioner agrees. The right to privacy is not a total right in the sense that if its being used for criminal purposes. Reporter before the San Bernardino shootings the majority in an nbc news poll said they were worried the government would go too far in terrorist investigations and violate the privacy of citizens. After the attack the majority worried the government would not go far enough. Apple says it will fight this new order in court. Lester . All right, pete, thank you. Overseas dozens are dead and injured after a bomb exploded near turkeys parliament, a horrific attack in the heart of the question tonight who did it . Nbcs Kelly Cobiella reports. Reporter a fireball in the heart turkeys capital at height of rush hour. Flames shot several feet into the air as people scrambled to safety. Police and the military sealed off the area while emergency workers rushed in to help the injured. The target was the turkish military. The powerful car bomb exploding just as buses carrying officers and soldiers drove by the armed forces headquarters, stopping at traffic lights. More than two dozen are dead and some 60 injured. The countrys deputy Prime Minister called it a wellplanned act of terrorism, the latest in a string of attacks in places many considered safe. Ten German Tourists killed in a suicide bombing in istanbul. More than 100 killed in a double bombing at a peace rally in ankara. Isis blamed for both attacks. Group in syria and iraq, but its also at wore with kurdish militias. Turkey now is in the eye of the storm. It faces a strategic predicament. It faces multiple insurgencies. Reporter turkeys president said tonight hes determined to fight those who carried out the deadly bombing. Kelly cobiella, nbc news, london. Pope francis is wrapping up his trip to mexico with an historic crossborder mass. The event, a few hundred feet from the u. S. Border attracting tens of thousand of followers on both sides. As nbcs Anne Thompson explains the pope is seizing this moment to make an emotional plea on the issue of immigration. Reporter a simple gesture and powerful message. At the u. S. Border fence pope francis builds a symbolic bridge from mexico on immigration. Francis himself the son of immigrants seeking to put a human face on the people fleeing what he calls grave injustices, among the hundreds of thousands here to see him, 21yearold Jasmine Flores who crosses the border every day to go to school. For him just to cam to juarez, means everything to us. Reporter no longer the murder capital of the world juarez is still a dangerous place. Father half jer kovalio runs a shelter for immigrants. He says he hopes francis can make americans see the people he helps every day should be treated with dignity. As he does on nearly every foreign trip, francis visited a prison. One of the inmate musicians overwhelmed. This evenings mass broadcast on both sides of the border. Religion reaches over walls, over mountains. Reporter the joy on the popes face marred only by a brief flafsh anger when an overzealous fan almost pulled tired and depressed. I just felt off and at the gym i started losing ground. Reporter diagnosed with lowt he began testosterone replacement therapy. My body mass came back to where it was. My energy was better, libido was a little better. Reporter now for the first time a National Study has found that a testosterone replacement gel provided some benefits to men 65 and older who suffered from lowt. Its toast ron treatment improved their sexual function, their mood, and depressive symptoms and perhaps also improved walking. Reporter researchers insist its too early to say whether all men with lowt should be on replacement therapy. Previous studies have found boosting testosterone might lead to increased risk of heart attacks and Prostate Cancer but millions of man say testosterone has improved their quality of life. Riley says testosterone sharpe has changed his life. There were risked of taking testosterone but the benefits far outweighed any risk. Reporter hes such a believer hes now the medical director for a chain of lowt clinics as the baby boomer generation looks to offset the effects of aging. Finish strong. Reporter tom costello, nbc news, washington. Still ahead tonight, know what youre eating. The package may say Parmesan Cheese, but you may be surprised to find what else could actually be in it. Some of it may not even be cheese. Also, another piece of the mystery solved over who will split the during its first year, a humpback calf and its mother are almost inseparable. She lifts her calf to its first breath of air, then protects it on the long journey to their feeding grounds. One of the most important things you can do is help the next generation. At pacific life, we offer Financial Solutions to accomplish just that. Ask a Financial Advisor the power to help you succeed. Whatcha doin . Just prepping for my boss party in a couple weeks. What are those . Crest whitestrips. They whiten way better than paste. 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Peliquis can cause serious and in rare cases fatal bleeding. Pdont take eliquis if you have an artificial heart valve or abnormal bleeding. Pif you had a spinal injection while on eliquis pcall your doctor right away if you have tingling, numbness, or muscle weakness. Pwhile taking eliquis, you may bruise more easily. Pand it may take longer than usual for bleeding to stop. Pseek immediate medical care for sudden signs of bleeding, like unusual bruising. Peliquis may increase your bleeding risk if you take certain medicines. Ptell your doctor about all planned medical or dental procedures. V eliquis treats dvt pe blood clots. V plus had less major bleeding. Both made switching to eliquis right for me. Ask your doctor if its for many of us a plate of pasta wouldnt be the same without a sprinkle of Parmesan Cheese, but when the fda investigated, it found one companys supposedly 100 Parmesan Cheese actually contains substitutes, including a filler that can be derived from wood pulp. So how do you know what youre really buying and eating . Nbcs Olivia Sterns has more. Reporter its no secret that americans love their cheese. Just ask seinfelds george costanza. I want to bite into a big hunk of cheese, bite into it like its an apple. Reporter an fda investigation raising the question whats in the cheese youre eating . In 2013 the agency targeted castle cheese saying what the company labeled as 100 parmesan cheaper cheeses and cellulose, an organic filler which can be derived from wood pulp blasting a company in a letter saying, quote, your Parmesan Cheese products do not contain any Parmesan Cheese. The company took corrective action but ended up filing for bankruptcy and could not be reached for comment. The fda allows up to 4 filler product like cellulose in cheese, but experts say its whats in the other 96 that might not be exactly what you think. Experts say some companies go too far. They are trying to do things that we dont notice but to cut corners so that they can make money. Reporter Food Fraud Initiative tracks cases of mislabeling citing some involving certain brands of cheese, extra Virgin Olive Oil and seafood. Top chefs like nbc contributor Tom Colicchio say they dont have being marketed as fresh and local and it isnt at all. Contributing factor, former fda commissioner dr. David kesler says the fda folk yisz on ensuring food safety, not advertising. We cant forget that there are people, that are companies who cheat the system. Reporter that may be grating news to fans of 100 real Parmesan Cheese. Olivia sterns, nbc news, new york. Were back in a moment with this good news. Youre down with crestor. Now theres a way you can get crestor for 3. Adding crestor, along with diet, lowers bad cholesterol. Crestor is not for people with Liver Disease, or women who are nursing,pregnant, or may become pregnant. Tell your doctor all medicines you take. 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The white house has announced that president obama will not attend the funeral for Supreme CourtJustice Antonin Scalia on saturday. Instead the president will pay his respects on friday when the late justice lies in repose in the courts great hall. Vice president joe biden, however, is scheduled to attend scalias funeral. George gaynes has died. If the name doesnt sound familiar some of his memorable roles surely will. Irritable foster dad in the popular 80s tv show and the bewildered commandant lessard in seven Police Academy movies. A lot remember him as the soap opera star with a crush on tootsie in the 1982 film. He was 92 years old. The winner at westminsters dog show was celebrated at the top of the empire state building. When we come back, they have been keeping the secret for weeks, but now why do some cash back cards keep throwing obstacles at you . First they limit where you earn bonus cash back. Then those places change every few months . I think ill pass. 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They have cashed in the second of three Winning Tickets for last months 1. 6 billion powerball jackpot. As our Janet Shamlian tells us, it was tough for them to keep their excitement under wraps. Maureen smith and david have known they were powerball winners for weeks, but its a secret they kept, even from their own family. Lost a lot of sleep. I lost over ten pounds, too, a lot of pacing at night, let me tell you. Smith says shes played for years. They bought only two tickets. It was just one. A 3 investment. David is an engineer who plans to retire but since the drawing has still been going to work. First day i arrived late to work they all suspected i won. Reporter david and maureen are splitting the record 1. 6 billion jackpot with two other winners, one in california who has yet to come forward and john and Lisa Robinson from tennessee. Can we see that ticket. Reporter who appeared on today just two days after the drawing. Unlike the Robinsons Dave and maureen took some time to claim their prize. Still, they were anxious about this day. Dreading it. Reporter couple told lottery officials when they arrived here today they would be taking the lump sum option. Thats 327 million plus change before taxes. In their home town of melbourne beach, florida, the mystery is we had no idea. They acted normal reporter couple say they will take care of family, donate to charity and david may buy a car. Otherwise no big splurges planned. I want to get a massage. Reporter Janet Shamlian, nbc news, tallahassee, florida. That will do it for us on a wednesday night. Im lester holt. For all of us at nbc news, thank lights, camera, access. I hate the new ka in. Ye, the literally rude kanye. Is the guy literally falling apart at the seams . The fights, the huge debt. The rumors that kim has had enough. How crazy it got at snl. Ooh. Thats a cool and a good question. And i do have an answer. Almost kanyed taylor swift