captioning sponsored by wnet >> stewart: on this edition for sunday, february 21: what's next on the long road ahead for the presidential candidates a revealing look at pope john paul ii's private correspondence with philosopher teresa timenyeska. kind of buttressing her claim to being so important in his life. >> and using drones to prediblght tornadoes. and, using drones to predict tornadoes. next on pbs newshour weekend. >> pbs newshour weekend is made possible by: lewis b. and louise hirschfeld cullman. bernard and irene schwartz. judy and josh weston. sue and edgar wachenheim, iii.

corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, alison stewart. >> stewart: good evening and thanks for joining us. the 2016 race for the white house is entering a new, faster- paced phase, with roughly 90% of the delegates in the nominating process still up for grabs. after winning yesterday's first- in-the south primary in south carolina and sweeping all 50 republican convention delegates, businessman donald trump is in

the lead. trump and his rivals are now focusing on the dozen states holding primaries and caucuses on march 1, known as "super tuesday," when a quarter of the nominating delegates are at stake. next saturday, it will be the the democrats' turn in south carolina, where hillary clinton and bernie sanders will compete in a primary. fresh off her victory in the nevada caucuses yesterday, clinton says she is looking ahead to the states that have yet to vote. >> i'm on my way to texas, bill is on his way to colorado. the fight goes on, the future that we want is within our grasp. thank you all, god bless you! >> stewart: the former senator and secretary of state had a decisivewin on the first in the west contest. she beat vermont senator bernie sanders by more than 5% of the vote and walked away with at least 19 of the 35 delegates at stake in the nevada caucuses. sanders received 15. right after her nevada win, clinton headed to texas-- the biggest prize for both political parties on march 1.

>> it's been eight months since i was here, and the stakes are even higher than they were then. now the supreme court hangs in the balance! >> stewart: clinton hopes her proven support with black voters translates into victory in south carolina. so far her weakness in the first contests has been with lower income voters and voters under 45 years old. today, sanders said voter turnout in nevada was not as large as he had hoped. >> by the way, we did phenomenally well with young people. i think we did well with working class people. we were taking on a candidate who ran in 2008. >> stewart: republican frontrunner donald trump says he has high hopes to win the seven southern states voting on super tuesday. >> i went to mobile, alabama-- 35,000 people. we went to oklahoma recently-- twice, 20,000 people, 20,000 people. no matter where we go, we fill up the arenas. >> stewart: in the final tally in south carolina, trump won 32.5% of the vote, 10 points

ahead of florida senator marco rubio, who edged texas senator ted cruz for second place. with a distant fourth place finish in a primary once won by his father and brother, former florida governor jeb bush called it quits. >> the people of iowa and new hampshire and south carolina have spoken, and i really respect their decision. so, tonight i am suspending my campaign. >> stewart: for more analysis on the presidential race, newshour political director lisa desjardins joins me now from columbia, south carolina. and lisa, donald trump is running a unique campaign and it seems to be his strength. how did that play out yesterday? >> absolutely. we saw him win by double digits in south carolina. that's not easy to do after such a big win in new hampshire. there's two different types of voters there. but we saw what he did, and he did very well with almost all income groups but not everyone. i think when we look at the long-term momentum for trump, that is the real question now, right? is this the man that is going to be the republican nominee am something i nghtsed in the exit

polls yesterday was loyalty among trump voters. when you asked voters yesterday if they were satisfied with only their candidate or could take other candidates as an acceptable nominee, 30% said they would only accept their candidate. of those republicans, the largest number, 49%, were trump voters. >> it was definitely a big win for mr. trump last nightment but there were signs of slowing momentum. can you walk us through what happened in the past month? >> that's right. if you look at the last few days, those voters went to cruz and rubio. you look at the very last day, there you see donald trump doing a little bit better, 22% but still not winning. and that's a big change from new hampshire. donald trump was winning those last minute deciders by and large. now is that just a factor, something that happened in south carolina or something that has changed about how voters in general look at donald trump? it's not clear. donald trump as you said, a unique campaign. no one who has won both new hampshire and south carolina in

the republican party has lost the nomination but again no one has ever been a multibillionaire reality tv star before either. >> senator marco rubio came in second last night. how is he going to capitalize on this? >> i think we really saw sort of a new energized rubio last night. he is appealing across-the-board to americans outside the republican party as well as in. and he's going back and saying i'm going to take a previous mantel of this party and carry it forward. listen one of his key quotes. >> now those of us who grew up when it was morning in america and ronald reagan was in the white house are ready to do for our generation-- are ready to do for the next generation what ronald reagan did for ours. >> so lisa t sounds like senator rubio is thinking about expanding the base. >> that's right. his advisors are almost obsessed with that concept. they realize the republican party in the long-term in presidential elections has a problem. and they think that marco rubio

is really the only one who can expand that base, not just among young people where marco rubio is starting to gain some momentum but especially when are you talking about diversity. you saw on stage he had african-american senator tim scott, indiana governor nicki haley, something rubio paid attention to in his speech last night. i think to some degree he seemed to have been more charged up personally than ever but he still has to deal with donald trump and there is a real question of when does he start swinging if he does start swinging and how at the current frontrunner. >> ted cruz came in third place. after having come in second place, in new hampshire and having won in iowa. what happened? >> right, that's not the direction the campaign usually wants to go in. but the cruz campaign is saying hey, it was very close. and it was. within a thousand votes here in south carolina. that is a close race am i think the bigger problem for ted cruz is not that he placed third here but more that his support is a very specific type of voter, very conservative voters,

evangelicals that will play well in a lot of the southern states coming up on supertuesday but past that, ted cruz might need to broaden his support in order to win the nomination when he has someone like donald trump on one side and marco rubio on the other. >> let's turn to the democrats. hillary clinton had a solid win last night after a really tough battle in new hampshire. but there could be signs of weakness. it was a mixed bag when it came to minority voters. can you explain what happened? >> look at how african-americans voter overwhelmingly for hillary clinton, 76%. that's getting into an obama type african-american support level. now you look at the other races, hillary clinton did not win with white voters. bernie sanders eked out a win there and she lost by more with latino voters. so it really was that african-american large majority that carried her. but think about a state like texas where there are more latino voters. and think about where hillary clinton is going next, it's texas. >> what is bernie scanders next move?

>> bernie sanders has to think strategy now. he has had phenomenal fundraising but he's got to think carefully about where he spends those dollars and where he spends his time. he's got some good places for him, massachusetts, vermont, he's got some happy states coming up in the sanders momentum category. he's got other places that might be difficult like the south after south carolina, arkansas, georgia, those kinds of places are where he needs to build more perhaps than he has right now. >> lisa desjardins from columbia, south carolina, thanks so much. >> my pleasure >> stewart: how complex is the delegate math on the road to each party's nomination? find out at pbs.org/newshour. >> stewart: pope francis said last week that any man who is unable to have a good friendship with a woman is, "missing something," and that even a pope can have a "healthy, holy friendship" with a woman. the pontiff was responding to a reporter's question about a new documentary detailing a three- decade-long friendship between pope john paul ii and a polish-

american woman. she was a philosopher named anna teresa timenyeska who died in 2014, nine years after the pope passed away. their correspondence is now the subject of a new program that will be broadcast on most pbs stations on april 5. here is an excerpt. >> i'm edward stourton, a british journalist, and i knew from researching my biography of john paul ii that anna teresa tyemienecka had collaborated with karol wojtyla, as he was known before he became pope, on one of his books, "the acting person." she died two years ago, and she might have taken the full story of their long relationship to the grave, but in 2008, a new york based expert in rare manuscripts received an unusual phone call. >> i was asked to get on a plane and go to new hampshire to look at some letters from pope john paul ii. the first thing that comes to mind, it's got to be wrong, it's

fake, it can't be right. then, all of a sudden you walk in and you see the items and there's no doubt that they are right. >> marsha malinovski negotiated a private sale and the letters were sent to john paul's native poland. i tracked them down in warsaw, the polish capital and established they were bought for a seven figure sum for the polish national library. they've been here ever since, unknown to the public. but after long negotiations the library allowed us to see and indeed film, karol wojtyla's letters to anna teresa tyemienecka. the story they tell begins here, at the archbishop's palace in krakow.

"dear madam professor, i received your message on the twelfth of july but because i've been away from krakow, i am only answering now. i propose that we meet and talk on the twenty ninth of july." >> karol wojtyla's guest here that summer evening was married, in her mid-fifties and a professional philosopher. like him, she had attended krakow's famous jagellonian university, before studying abroad and settling in the united states. and she had got in touch with the cardinal because she admired a book of philosophy that he'd written. it's a wonderful picture isn't it? bill and jadviga smith, both academics based in new england, became anna teresa's close friends towards the end of her life and are the executors of her will. when she did write to cardinal wojtyla, she wrote the book and then wrote to him and said, can i meet you? it's just the sort of impulsiveness in the way she...

>> yes and no. it wasn't necessarily-- well here, she starts because she spotted the book and it would be nice to write to this cardinal or bishop. here, here is the book, let me just fix it in english. >> yes, he was interested in having his ideas promulgated in the west. >> but i'm still struck, it was quite a thing to get on a plane. was that? >> that was not unusual for her. not at all. to get on a plane and do something like this, this was part of her character. that's the way she tackled everything. >> at first the letters focused on philosophy. they traded ideas in the way you might expect from two deep thinkers. >> i have been thinking about the possibility of a deeper philosophical conversation. thank you for the article, "the three dimensions of phenomenology", ontological and transcendental. >> soon, they were meeting regularly and writing to each other often. but this was the 1970s, in the deep chill of the cold war years, and communist poland was an atheist police state.

in october 1974, a little over a year after first meeting anna teresa tymienecka, cardinal wojtyla travelled to rome for a big conference of bishops, and he took a bundle of her letters with him. he stayed for more than a month at the polish college where polish student priests normally lodge in rome. here he could answer anna- teresa's letters safe from the prying eyes of the secret police. and, for the first time, he dropped her academic titles and addressed her simply as, >> "dear teresa anna, i would like to reply to four of your letters i received in july. i didn't post them before as i didn't trust the polish post office." >> eugene kizluk studied the letters in preparation for the sale. >> this is very much the first informal letter that he wrote to

her. >> i have brought them with me to rome, and i am reading them again. they are so meaningful and personal. >> by now karol wojtyla and anna teresa tyemienecka had a joint project, and english language version of the book that first inspired her to get in touch with him. it was to be more than a straightforward translation. she wanted to develop and refine his ideas. and that meant intense discussions during long hours together. they would meet regularly in rome and poland and even when they were seeing each other every day, they would sometimes write before and after their meetings. >> "i was very happy to see you yesterday. i would like to talk to you tomorrow. i'm coming back this afternoon, we could continue our conversation. father dziwisz will deliver this letter. it is good that we could talk on the phone before your departure." >> their relationship was on two plains. one was intellectual, the other one was personal and very emotional. they became very close to each

other, on both levels in fact. the two mixed up and it was also very difficult for them to separate the two. >> in new york, i sought out the one journalist who had some sense of the importance of the relationship. the veteran reporter, carl bernstein, interviewed professor tyemienecka when he was writing his john paul biography. and she told him about her correspondence with the pope. >> right away when i went to see madam tyemeniscka as she refers to herself, in pomfret, she immediately referred to this correspondence and in fact read me one of the pope's letters to her as a kind of way of buttressing her claim to being so important in his life. >> that was two decades ago. and when he asked her about her

feelings, she swatted the question away. i said to her, were you in love with wojtyla? and she says, no i never fell in love with the cardinal. how could i fall with a middle- aged clergyman, i am still considered a beautiful woman and i'm surrounded by young and handsome men. to fall in love with a clergyman? there could be no success at all. and i said, no romantic feelings? she said, this question, it doesn't really apply. how can you ask me such a silly question? >> for her to fall in love with him is completely understandable to me. he was handsome, he was powerful, he was on a track that was extraordinary. he was polish. how could you not be taken with that, all that charm in one person? >> there is nothing in karol wojtyla's letters to suggest he broke his vow of celibacy, and everything we know about this iron-willed man suggests he would have kept it.

in october, the princes of the church were back in rome for another conclave. choosing a new pope for the second time in less than two months. on the third day at just after 6:20 in the evening, the white smoke rose from the chimney in the corner of st peter's square, announcing the election of the first non italian pope for 455 years. in the papal apartments, karol wojtyla, now vicar of christ and supreme pontiff of the universal church, wrote almost immediately to anna teresa tyemienecka. >> dear teresa anna, i'm writing after the event. i promise i will remember everything at this new stage of my journey. the whole thing is written too deeply into my life for me to do otherwise.

>> anyone in the u.s. who owns a drone is now required to register it with the federal aviation administration at a cost of $5. approximate 25,000 drone owners did so before last friday's deadline. anyone caught with an unregistered drone faces a fine up to $27,500. aside from recreational use, drones are also being used by scientists, experimenting with how to better predict severe storms like tornadoes. that is a priority in oklahoma where more than 100 tornadoes touched down last year. the newshour's stephen phee has more. >> reporter: they may look like toys, but these small planes flying high above oklahoma state university in stillwater may one

day help weather forecasters predict storms and save lives. oklahoma state, along with three other universities, won a $6 million national science foundation grant to develop small weather-sensing drones. >> reporter: 24-year-old alyssa over the past two years, she's been building her own aircraft, named maria. >> the project is basically designing an aircraft, a small one remotely piloted, that can fly around severe storms and collect as much data as we can so we can lengthen that warning time and make it more safe for everyone living in tornado areas. >> reporter: as an engineer, her job is to build a plane strong enough to fly close to developing supercells, the mega storms that often lead to tornadoes in oklahoma. avery's aircraft is designed to deploy sensors that monitor temperature, windspeed and atmospheric pressure. the ground?asure this stuff from it's better to do it in the air? >> yeah, so right now we have radar, which obviously everyone knows about, so it surveys at a higher altitude. it did improve weather models a

lot but when it comes to that really precise, like, how close is it going to be, where is it going to be, what's actually going to turn into a tornado versus just circulation which is much less dangerous, they don't have that. it's called in situ, which is right there thermodynamic data. >> reporter: in other words, forecasters need to get closer to the action, scanning parts of the atmosphere that traditional radar, weather balloons and sophisticated weather towers can't reach. that sweet spot is called the lower atmospheric boundary layer, a zone roughly 1,000 feet off the ground. phillip chilson is a professor of meteorology at the university of oklahoma and is also involved in the project. >> there has been a need for high quality measurements of the lower atmosphere that's been known by the meteorological community for decades. the lowest level of the atmosphere is so dynamic spatially and temporally, that it's very under-sampled at present. >> reporter: so to get more information about that part of the atmosphere, students at oklahoma state aren't just

building the planes, they're designing the sensors and writing the software that processes the data gathered in the skies. 21-year-old nicholas foster is designing a small pod that aircraft-like maria may one day carry into a storm. >> essentially it's just a packet of sensors. so what i'm doing is these will go inside of maria, and these will be the things that fall out and parachute down and take the data on the way down. >> reporter: the oklahoma state researchers hope this technology can be used at home and around the world to give forecasters earlier warnings of severe weather. >> getting this data will allow them to take our forecasts which now for severe storms and tornadoes at the ten to fifteen mark, maybe up to the hour mark where we can actually warn on forecast and say, hey you know you're going to have severe weather in your area that you're going to see something like a tornado. and you know that's really going to save lives in the end.

>> this is pbs newshour weekend, sunday. >> stewart: a michigan man who allegedly shot and killed six people randomly last night is now in police custody. 45-year-old jason brian dalton was arrested this morning, and he is due to be arraigned tomorrow, most likely on murder charges. the mass shooting spree happened unty during a four hour span.oo police allege that after dalton shot and wounded a woman in an apartment complex parking lot, he then shot and killed a man and his teenage son in a car dealership, and later, shot and killed four more people in a restaurant parking lot. one other person, a 14-year-old girl, was seriously wounded. police say they found a semi- automatic handgun in dalton's vehicle, but dalton had no criminal record, and they do not know the motive for the attacks. secretary of state john kerry says a cease fire in the five- year civil war in syria is closer than ever before. after meetings today in syria's southern neighbor, jordan, kerry

said he had struck a" provisional agreement" with the foreign minister of russia, which supports embattled syrian president bashar al-assad. kerry said he expects president obama and russian president vladmir putin to speak in the next few days to try to finalize enforcement details and reach out to opposing sides in the war. as fighting continues, the islamic state group claimed responsibility for car bombings today in the cities of homs and damascus that killed more than 100 people. india is trying to quell protests that have jeopardized the water supply in the capital of delhi. the government sent troops today to northern haryana state, where members of a rural caste are demanding more benefits. the protesters have sabotaged pumping equipment that supplies most of the water to delhi's 16- million people. the government has imposed water rationing while engineers try to repair the equipment. indian security forces have killed at least 12 people since protests turned violent on friday.

>> and finally, drew hunter has set a new american high school record for running the mile. at the annual miller games track meet in new york yesterday, hunter posted a time of 3 minutes and 57.8 seconds lower his own previous record for the indoor mile by nearly half a second. the 18 year old virginia senior is only the 7th high-school student to run a sub4 minute mile indoors or outdoors since jim ryan did it first in 1964. that's all for this edition of pbs fushour weekend. thanks for watching. i'm alison stewart. good night. captioning sponsored by wnet captioned by media access group at wgbh access.wgbh.org

>> pbs newshour weekend is made possible by: lewis b. and louise hirschfeld cullman. bernard and irene schwartz. judy and josh weston. the cheryl and philip milstein family. the citi foundation. supporting innovation and enabling urban progress. sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you.

♪ superstar tenor andrea bocelli travels to hollywood to perform some of the greatest melodies from the silver screen. ♪ moon river relive oscar-winning songs... ♪ wider than a mile movie musicals... ♪ maria classic themes... [ singing in italian ] and epic songs... [ singing in italian ] join us when the stars come out...