Austin, texas. Ood evening from austin, texas. Just over 36 hours until polls open here and across 11 other states. It is shaping up to be a pivotal night for so many campaigns. The republican race too on a mean edge today. Ted cruz and marco rubio attacking donald trump over everything from his taxes, to his biness connections and foreign policy. And trump was on defense, especially when it came to an interview thik morning in which trump was asked about a supporter who used t be the grand wizard of the ku klux klan. Reporter todays fire storm was not over what donald trump did, but what he didnt do. Just so you understand, i dont know anything about david duke. Reporter failing to disavow david d de in this interview. You condemn them and dont want their support . I have to look at the group. I dont knkn what group youre the ku klkl klan. Reporter duke is not formally endorsed the gop frontrunner but has told his Radio Audience that voting against donald trump at this point is really treason to your heritage. Trump tweeted he did disavow duke. I disavow, okay . Reporter less than two days before super tuesday, marco rubio pouncing. There is no place in the conservative movement for david duke, the ku klux klan or any sort of hatred or bigotry in america. I dont understand it, but donald trump refused to disassociate himself and condemn white supremacists. Reporter trump also drawing fire this morning for retweeting a quote from a fascist atall january dictator. Do you want to be associated with a fascist . No. I want to be associated with reporter cruz also accusing trump of not wanting to release his tax returns because of possible mafia ties. Maybe his taxes show those business dealings are a lot more extensive. Let me stop you there. Thats openly speculative. Do you have any facts to support that donald trump has mob ties . S aonstruction owned by a mobster in jail. Reporter 2the bare knuckle insults flying. Alabama senator Jeff Sessions i am pleased to endorse donald trump for the presidency of the United States. Reporter that is trumps first senate endorsement. While a swath of the gop may be trying to stop the billionaire, another part is embracing him. Kate . Gabe gutierrez in richmond, virginia. Nomination could face a make or break night on tuesday. A loss for example for ted cruz here in his home state of texas could be devastating. Holly jacksons live in Oklahoma City with a look at the importance of this big vote. Reporter super tuesday is when the story line should shift from all the attacks to the arithmetic. Adding up the delegates each candidate takes home. Nearly half spread out across 11 states. Ted cruz campaigning in this state today is calling it a battleground for him. But his must win, well, thats texas, his home state which has the most super tuesday delegates, 155 in all. Cruz most likely will pull it off. His campaign tells nbc to watch arkansas too. Marco rubio meanwhile spending time and resources in virginia, one of his best s sts to notch his first win. Pluck off delegates in those su suburbrb area. John kasicis already looking passed super tuesday to march 16th when ohio votes for the governor, do or die from him. Even he acknowledged that donald ump could steam roll on tuesday. For the frontrunner, its not a matter of which state he will win but how many. Trump lookominant in nearly all of them. Republicans could wake up wednesday morning to find trump with an overwhelming lead. Thanks so much. Here in texas, argue niezers say they expect a big increase in the number of latino voters this super tuesday. The last exit polls here show one in ten republican primaryry voters were latino and theyre not all voting f f their home state senator ted cruz. Trump is attracting some hispan voters. Just like juan gomez. Early voting here. You already voted right . Right. I voted for donald trump. When you first told me that, you were a little reluctant to tell me. W ll, theres a lot of hispanics that are spiteful or whatever about donald trump. I like donald trump for several reasons. Number one, you know, i think we need somebody to manage the country. And hes a businessman and very successful businessman. But the other thing is that he he tells it like it is. What about the wall . I think at one point, we need something that will stop the influx of people coming into the United States. I think its you know, the way the economies are in our two different countries, i think we can manage the people that are here. But you want to stop the flow the flow needs to stop, yes. Somebo thats coming to the United States in from mexico, they call it el norte. Of life. Mexico is not providing that life for them. Its fine, b unfortunately theres a lot of bad habit that we have in our society. We supply needs for those people. The government . Yes. You told me youre a compassionate man, youre a christian. Im very compassionate. I walk with the lord. But theres certain things that, you know, are important for our country. You know, its like when you run a busisiss. A business has to be healthy. Our nation is not healthy right now. Juan gomez speaking to me there. Trump making some inroads here in texas. Thedemocratic candidates also turned their attention to super tuesday states. With Hillary Clintons decisive win in south carolina, especially among africanamerican voters, Bernie Sanders faces an arduous path forward. Reporter secretary clinton storming through the south after her resounding victory in south nashville today. I will stand up and work and fight for you reporter heroin smashing expectations. She toppled sanders by nearly 50 points and netted close to 90 of the africanamerican vote, even more than barack obama won over in 2008. All that signalinga potential strong showing come super tuesday. On meet the press today, sanders acknowledged the magnitude of the defeat. Well, we got decimated. Thats what happened. Among older africanamericans it was pathetic. Reporter but he also vowed to fight on. That persistence on display at a rally in oklahoma. There would be nototng that would give me more pleasure than to defeat donald trump. Reporter sanders faces a steep climb. Our three new nbc news wa street journal polls show nearly 2 to 1 margins in georgia. I just dont see a path for bersz bernif sanders. Assuming nothing legal happens out of the justice department, Hillary Clinton is goin to be the nominee. Reporter and clinton is already pivoting to the general election, again taking a broad swipe at donald trump. America remains great. But what America Needs to do now is become whole. Reporter in a rare moment of solidarity, Hillary Clintons campaign retweeted senator sanders who condemned Donald Trumps refusal to disavow former kkk leader david duke. Americas black president cannot and willlnot be succeeded by a hate mongerer. And the man who plays the fictionalresident on scandal campaigned with clinton today and mentioned trumps latest controversy. Continue to cast a cloud over her campaign this ekend. The state Department Working to release the final batch by mondays Court Ordered deadline. Donald trump vowing to raise the issues of her emails every day if the two face off in a general election. Kate . Kristen, thank you. A suburban Virginia Police department is mourning the death of a young officer killed in the line of duty just one day after she was sworn in. Steve patterson has the story. We have three confirmed hits. Reporter the call, so unthinkable here, it was called into question. I just want t be clear, do we have officers involved in a shooting . We have three officers that have been shot. Reporter words that confirm the worst. Three officers from Prince William county Police Responding to a domestic shooting in woodbridge, virginia, a sleepy officers wounded. 28yearold officer ashley gwendon killed. Police William CountyPolice Department is i i very deep mourning over the loss. Reporter the suspect 32yearold ronald hamilton, an army s sff sergeant captured. The accused and his wife were involved in a domestic altercation for some period of time that day. She was shot and killed allegedly by the accused. Officer gwendon was just sworn in on friday. Welcoming words, be safe, at the end of a now tragic tweet. First serving her country six years in the marine corps reserve. She clearly had a passion to serve others. Reporter now White Flowers and black bunting, shock to a department that in nearly four line of duty deaths until now. A trail of blue lights in a Police Procession celebrating a life lost too soon. Steve patterson, nbc news. As a fragile ceasefire enters a second day in syria, the International War against isis rages on. One woman has been battling them on her own for over a year. Shes a yazidi and isis is threatening to wipe out her people. Earlier this week, sheas presented with a Major International award for her work. Reporter shes one of iraqs most adored politicians and the islamic states most wanted woman. When shes not rallying her people to fight isis, shes helping women and girls escape them. Families turn to her for help. 11 members of his family are messing. Women. Children. Yes. Attacked Iraqs Yazidis 18 months ago, trapping them on a mountain, she cried out for help in parliament. [ crying ] her people are in crisis. Nearly half a million are in refugee camps, hundreds of men disappeared, feared dead. More than 2,000 yazidi women and girls are still missing, held captive by isis. Those terrorists buying and selling yazidi girls. Reporter she smuggles the women and children to safety. Jilan escaped five months ago with her sister, but had to leave another sister behind. Translator shes only 11 years old. Isis is asking for 25 to 35,000 for her freedom. Reporter its dangerous work. Are you afraid at all . No. Maybe a little bit. Yeah. Says is seeing her people suffer while the world turns a blind eye. All of them support me, yet you are right. You need support, but nothing happened. Reporter so far shegs helped rescue more than 1,000 women and girls. All of them are looking for me to give hope for them. Reporter and nothing, she says, will stop her. Nbc news, northern iraq. When nightly news continues on this sunday, lowing Young Children to fire a weapon. 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Reporter for the hood family in central iowa, shooting is a way of life. Its just a fun sport to do. Its fun to relax and just go down and release some stress. Reporter dad brian is coach of the local scholastic shooters. 13yearold emma isnt allowed. When i learned i couldn do it, it kind of got me a little reporter so the family now supports iowa lawmakers moving toward a new law that w wld allow children of all ages to handle handguns. This is not about giving our children the combo to the g g safe. This is about allowing them in a supervised scenario learn a great sport. Reporter last week the iowa house approved the measure, b the debate was fierce. We pass laws for those parents who lack the parents skills needed to protect their own children. Reporter the bill now goes to the state senate. But opponents are quick to point to cases of kids getting their hands on a gun with tragic results. This idaho mom killed last year when her 2yearold got ahold of their concealed handgun while they were shopping at walmart. Most states dont specifically restrict handgun use by children. Allowed to use handguns. For the Brady Campaign to prevent gun violence this debebe takes away from what they see as the more serious issues. It represents the gun lobbys vision, which is selling as many guns as they possibly can, that every mother, father, and child in america is armed to the teeth rather than focusing on the things we really can do through policy. Reporter theheuestion for lawmakers in iowa now are guns safe in these hands. Nbc news, new york. Up next, we go out to l. A. Al roker joins us live it takes a lot of work. To run this business. But i really love it. Im on the move all day long. And sometimes, i just dont eat the way i should. So i drink boost to get the nutrition that im missing. 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Thats where we find our al roker. Reporter the weathers not a problem, thats a good thing. Everybody is really anticipating chris rocks performance tonight. I actually got to see him last night at the comedy store. He was still working on his monologue. If theyre any indication what i saw last night, we are in for one heck of the night. The diversitytyssue is big, big there were protests tonight being held just not too far from where this red carpet is. Al sharpton reading those protests as they brought a lot of people out. In response to this, the academy has presented a slate of very diverse presenters, sofia veara, morgan freeman, kerry washington, kevin hart, a lot of folks like that. And of course there are the awards. One of the ones that everybody is expecting, leonardo dicaprio, who has been denied an oscar for so long is an odds on favorite to win for the revenant. The red carpet is rocking. Well continue to watch it for you. Kate, back to you. Thanks so much. 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Reporter its an interstate Convenience Store the size of a 120 gas pumps, 34 types of taffy, 26 flavors of fudge. But at bucees, one of the biggest draw is the deli style jerky bar. Me and my friend made a trip from san antonio. Reporter 35 kinds in the glass case. Jerky sales a a exploding. Reporter the dried meat is the snack of the moment. Sales up 12 last year across the country. Americans spending almost 3 billion. Its protein. Definitely better than potato chips. Reporter and thats the allure. High protein, low fat, very portable. Lean, good energy source, and whats not to li. Reporter so popular, one of the nations hottest franchises, the beef jerky outlet where they bloody mary flavored jerky. Todays jerky has come a long way from those pressed slim jims. Now boutique brands with innovative flavors. Cherry maple. Reporter theres also ghost pepper, teriyaki, sweet and spicy. No refrigerator required. But it doesnt mean it will last. H w quickly will you go through this . Ill probably be donwith it by the time we get to dallas. Reporter hot and dry and fun off the shelf. My kids love it. That is nbc nightly news for this sunday night. Lestst holt will be in tomorrow. Im kate snow. Ill see you tomorrow on msnbc from houston. Have a great night. She was smart. She was beautitil. I cant even tell you how much i loved her. Cant even describe the love. She walked out her front door and was never seen again. A young mom to two little girls. This woman had gone out to get the mail and disappeared in her pajamas. And that was just mystery number one. It was a crime right out of the movies. A secret imposter and something sinister. Oh, high gosh. Did d is really happen . A plot hatched through a Virtual World turned suddenly, violently real. There was a scream. A drop of,blood came from her nose. He was a part of the game. What happened the day venus