Prince harry has to do with it. But first, the nightline 5. Do you think your heartburn pill works fast . Zantac works in as little as 30 minutes. When heartburn strikes, take zantac for faster relief as nexium or your money back. How much protein does your dog food have . 8 , 20 . Real salmon and tuna has 30 protein. Support your active dogs whole body health with purina one. Number one in just 60 seconds. With the card most accepted by top doctors and specialists, you have the compassion and security of blue cross. Giving you the strength to drive forward. Independence blue cross. Live fearless. Good evening on a high stakes night for the republican president 14u8 candidateses heading into tonights big debate in milwaukee, donald trump needed to prove hes a substantive candidate and jeb bush needed to demonstrate hes still a viable one. But perhaps most importantly dr. Ben carson who has been surging in the polls needed to deal with the mounting questions about whether hes been honest about his own past. Heres abcs david wright. Reporter its a reality show where the stakes couldnt be higher. It sounds like a game show but its not. Reporter this Time Next Year right about now, in fact, one of the apprentice on that stage will either win 270 electoral votes or youre fired. Youre fired. Youre fired. Reporter or not, one year from this week its all over. So we begin. Reporter so the president ial reality show is getting realer by the day. Tonight new Jersey Governor Chris Christie was voted off the island because of his poor poll numbers. The tribe has spoken. Reporter surviving to debate at the socalled kiddie table but not with the big boys. Like contestants on the bachelor or in her case, the bachelorette hoping to win that rose. Two of the candidates are doing well enough to get secret Service Protection starting tomorrow. Dr. Ben carson, code named eli, now the frontrunner. And people who know me know that im an honest person. Reporter and donald trump, code name mogul, running a strong second. We cannot let hillary clinton, who is the worst secretary of state in the history of our country, win this election. Reporter both of them pulling twice as much support as their next nearest competitor, according to the polls. Between them, nearly 50 more than all the other gop candidates combined. One big question, will carson still be the frontrunner after tonight . Well, first of all, thank you for not asking me what i said in the tenth grade. I appreciate that. Reporter carson has been complaining the media is out to get him. I do not remember this level of scrutiny for one president barack obama when he was running. In fact, i remember just the opposite. He seems to feel like people have it in for him. The interesting thing is he thinks this is a tough week when really if you really look at where the stories are coming from, theyre all deriving from one single source, his own words. This is just reporters asking questions about things hes said. Reporter reporters have been pouring over carsons unusual theory about the pyramids as outlined in a 1998 commencement speech. Now, my own personal theory is that joseph built the pyramids in order to store grain. Reporter theyve questioned specific details about his inspiring life story. And everyone has been scratching their heads over a story hes told many times about nearly stabbing someone to death years ago. I tried to stab him in the abdomen. And fortunately under his clothing he had on a large metal belt buckle. Reporter so far reporters have been unable to confirm the details of that incident, leaving a strange situation. A candidate insisting he almost murdered somebody and the skeptics doubting it. The irony is not lost on donald trump. This is the only election in history where you are better off if you stab somebody. A lot of weird things are happening. This is a strange election, isnt it . Reporter tonight this from carson on the vetting issue. I have no problem with being vetted. What i do have a problem with is being lied about. And then putting that out there as truth. Reporter but for the most part tonights debate was distinguished by the absence of sharp attacks. Tonight the moderators steered clear of any inkling they were going for a gotcha. Their question what specific steps would you take to balance the budget. Reporter substantive. How do you reassure americans their jobs excellent question. Reporter pointedly unpointed. What specific regulations would you change and how will that lead to jobs and growth . Reporter fox business clearly sought to avoid any suggestion they were trying to provoke a food fight. Business issues can be riveting. Reporter the other candidates, that made it all the more difficult to force a make or break moment. So did anybody succeed . I think this debate now is show that basically were probably down to four candidates this race is, which is ben carson, donald trump, ted cruz, and marco rubio. Reporter well, on trumps big idea to build a wall to keep Illegal Immigrants out, which he himself parodied on snl the president of mexico is here to see you. Donald. Enrique. I brought you the check for the wall. Oh, thats so wonderful. We will have a wall. The wall will be built. The wall will be successful. And if you think walls dont work, all you have to do is ask israel. Reporter kasich tried to top the wall. Silly argument. Its not you should let jeb speak. Its unfair. Reporter bush tried to climb over the wall. Thank you, donald, for allowing me to speak at the debate. Thats really nice of you. Really appreciate that. Reporter the candidates providing the fireworks while the panel pretty much ducked. Theyre doing high fives in the Clinton Campaign right now when they hear this. Thats the problem with this. We have to win the presidency. Reporter Carly Fiorina scored points off trump and his boast that hes on great terms with vladimir putin. I got to know him very well because we were both on 60 minutes. I have met him as well, not in a green room for a show but in a private meeting. Reporter trump clearly growing annoyed with her. Why does she keep interrupting everybody . Yeah. Boy. Terrible. Reporter a Strong Performance from many of them. If i am our nominee they will be p party of the past. We will be the party of the 21st century. I believe in america. If we get back to the free market principles and constitutional liberties that built this country, we can turn this country around. I think the winners tonight were probably marco rubio and ted cruz. If i was putting on a bet on a stock i would put them as buy. I would put jeb as a sell. Reporter immediately after the debate signed off, Hillary Clintons campaign tweeted out this image of her looking bored. Gopdebate. Im david wright for nightline in new york. Up next here on nightline, Barbara Walters with a fascinating where are they now story. Kate oh kaelin, the house guest who became the household name during the simpson trial. Ya know, viagra helps guys with erectile dysfunction get and keep an erection. Talk to your doctor about viagra. Ask your doctor if your heart is healthy enough for sex. Do not take viagra if you take nitrates for chest pain; it may cause an unsafe drop in blood pressure. Side effects include headache, flushing, upset stomach and abnormal vision. To avoid longterm injury, seek immediate medical help for an erection lasting more than four hours. 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Reporter you may remember kato as a witness in the trial. A tenant in jimp sons guest house. A struggling actor who is both a friend to o. J. And nicole. He became an overnight celebrity after his trial testimony. Kato helped establish a timeline for investigators me sat down with me recently to share his recollections. O. J. Simpson, hes very much a character out of shakespeare play. Heres a man who had everything and lost everything and became, from a adored athlete to a pariah. We will bring you up to the minute news on o. J. Simpson. Reporter my introduction on the simpson case began on Live Television as hugh downs and i went on air on 20 20. Their bodies had been discovered outside nicoles home in brentwood. It was a grisly crime scene. If i saw o. J. Today i would say, o. J. , did you do it . And what do you think the answer is . What would i think he would say . I think he would say absolutely not. Approximately what time was it when you got your food . 9 25. 9 26. Reporter his testimony would bookmark both ends of what the prosecution argued was the time peri period in which simpson could commit the crime. O. J. Simpson came by my guest house and he knocked on my door and said he was going to go out to eat. Went to mcdonalds. Reporter the prosecutions opportunity clock began at 9 36 p. M. When o. J. And kato returned to rockingham. Kato went to his bungalow, o. J. To his house. An hour and ten minutes later a limousine arrived to take simpson to the airport. He killed her out of jealousy. Reporter the means of the crime according to the prosecution was a knife that was never found. You saw o. J. Get into the limo. Tell us about that. I was helping pack stuff into the limo because he was going to chicago and there was a bag that was ready to be packed. He said, dont touch this bag and that bag was never found. A suitcase type bag . Looked like a backpack. Now do you think it may have been the murder weapon . I dont know what was in there but something in there enough for o. J. Simpson to say dont touch. Never was found . Never was found. You are reminded that you must not be influenced by mere sentiment, conjecture, or public feeling. Reporter the jurors found out and then reached a verdict in less than four hours of deliberation. We the jury find the defendant orenthal jay switch son not guilty of the crime of murder pony coal brown simpson. A nell nippon nicole brown simpson, a human being. Count one of the information. We were together, you and i, in los angeles when the verdict of not guilty came out. You were shocked. I remember your face. I remember that because you asked me, i think off camera, you said, what do you think . I whispered in your ear, i said, i think they made a mistake. You still feel that way . Yeah. Reporter kato kaelin still has some of his boyish looks 20 years later but his life is very different. I used to call you americas favorite house guest because you lived in the guest house of o. J. Now you own your own home, you have your own business. Tell us about your life. Yeah, its good. My goal actually one day in life is to have someone live behind me. But, yeah, what im doing now is exciting because i started a clothing line, barbara, its called slacker. Wait a minute. Is that auto biographical . No, but people would call me, hes the biggest slacker. I said, take that and i came up with this product line called slacker. Reporter ron goldmans family spearheaded by his father and sister kim went after simpson in a civil suit, charging him with responsibility for rons murder. They won big time. The jury found simpson culpable and awarded a judgment of 33 million. Mr. Goldman, whats your reaction . Your reaction . Wonderful reporter o. J. Simpson suffered severe financial consequences me didnt have the 33 million the jury awarded them. And goldmans have had trouble collecting. So far they have received only a tiny fraction of what is owed them. But he would soon face yet another jury. Simpson was convicted of robbing a dealer of football memorabilia at gun point and stealing back mementos and souvenirs that used to belong to him. A hotel camera caught him on tape. We were just robbed at gun point by o. J. Simpson. Can you send pleahere, please. My lawyer told me you cant break in his room. Reporter the sentence was serious jail time, 9 to 33 years. He is in prison now, but not for murder, not for killing nicole. Right. And i think him being in prison, im not such a believer in karma but i switch my mind mind to that because i think karma came back to him. Orenthal. When nevada convicted him it almost felt like, hey, l. A. , this is how you do a trial. We should say that Barbara Walters presents american scandals monday nights at 10 00 eastern on investigation discovery. 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The First Six Months after i got hurt, my life fell apart and was falling apart in front of me. I had no job. I had no teeth. I could not xhurin caught to my family. I couldnt identify who my family really was. So i really, really faced some extreme trials. Reporter the crash left her with a shattered jaw, a broken leg, damage to her spine, burns, a hearing impairment, and traumatic brain injury. Doctors told her she would never walk again. But she did more than walk. After 38 surgeries to repair her body, it was healing power of snowboarding that gave her life new meaning. You had never gone snowboarding before you were wounded . Right. And now in the world of paralympics you are number five in the world in terms of snowboarding . Yeah. Im ranked fifth internationally for womens paralympics. Reporter she is on track to compete in the 2018 paralympics. Yes, i am considered disabled. I am classified as a disabled person. Im handicapped. But if i can go and i can do Something Like this that i couldnt do before, i mean, that gives you the power and the strength to want to try to overcome anything at this point. Reporter but kirstie still has another trial to overcome. When she finishes her trip doctors will amputate the lower leg that causes her so much pain. Despite her physical and emot n emotional scars she still has a smile on her face and determination to finish the journey that has given her a new purpose. Kirstie makes her way to london, the last stretch of her trip presenting her final dog tag to prince harry, remembering another marine who didnt survive when his helicopter went down. Please welcome, ladies and gentlemen, sergeant kirstie ennis. Reporter tonight at the standup for her res event in new york, kirstie is recognized for her bravery and sharing her message of hope and strength this veterans day. Like everyone else in the front rows tonight i do not want anyones pity. We want people to push and challenge us in order to grasp a new sense of purr and direction. Reporter for nightline, im boot woodruff in new york. Our thanks to my friend bob woodru woodruff. We should say the Woodruff Foundation does great work. Thank you for tuning in to abc news tonight. Tune in to gma first thing in the morning. And as always, were on 24 7 on our Nightline Facebook page and on ab