captioning sponsored by cbs . >> quijano: breaking news on the clinton email investigation hillary clinton is cleared by the fbi following a review of recently discovered emails. how will it shake up the race with 48 hours to go? also tonight, the view of the u.s. election from mexico. >> there is great concern here that a trump victory could lead to an economic shock. >> quijano: election 101 turning a bitter campaign of uncivil discourse into a teaching moment. >> there is no topic that is off limits. >> none. >> word from washington is-- . >> quijano: and election night 1952, a ground-breaking event for broadcast journalism and a triumph for cbs broadcasting legend. >> no state has been decided yet. general eisenhower is leading at

this particular moment. >> this this is the "cbs weekend news." >> quijano: good evening, i'm elaine quijano with a western edition of the broadcast. with about 48 hours to go before the polls begin to close, there is breaking news tonight from fbi director james comey on those recently discovered emails connected to hillary clinton's private server. comey sent a letter to a congressional committee today saying the fbi's review of the additional emails has not changed the decision not to prosecute secretary clinton. nancy cordes is covering the clinton campaign. >> reporter: clinton was on the way from philadelphia to cleveland when news of comey a letter broke. campaign aides could be seen reading the letter aloud to the others. comey wrote after reviewing a large number of emails we have not changed our conclusion from this summer when he recommended against prosecuting clinton. communications director jennifer

palmieri. >> we're glad to see that he were shall-- that he found that we were confident that he would, that he has confirmed the conclusion that he really reached in july, and we're glad that this matter is resolved. >> reporter: hillary clinton began her sunday like many americans, at church. ♪. >> oh yes snvment. >> reporter: she told the african-american congregation at mount airy church in philadelphia that their civil rights are on the ballot. >> everything you care about, everything i care about and i have worked for is at stake. >> reporter: minority turnout is critical to clinton's strategy. she came pained this weekend with a series of high profile black supporters. power couple beyonce and jay-z, basketball superstar lebron james and new jersey senator corrie booker. >> we got to remember that when we stand together, when we work together, we written together. >> reporter: president obama was dispatched to florida today

where they marked the final day of early voting with a tradition known as souls to the polls. the clinton camp feels confident if battleground nevada after a surge of hispanic voters in las vegas prompted officials to extend early voting for several hours. michigan on the other hand has suddenly become so close that clinton is heading back there on monday. and it was her husband's sole stop today. >> i believe hillary will carry michigan if we turn out. >> reporter: a clinton aide says her reaction to the comey letter was understated and she hasn't mentioned it here in cleveland. they believe the word will get out whether clinton talks about it or not in these closing days. elaine? >> quijano: nancy cordes, thank you. >> donald trump was making his final push for votes sunday when he got the news about hillary clinton's email. here is major garrett. >> you have to understand, it's a rigged system. and she's protected. >> reporter: before an enthusiastic minnesota crowd donald trump eluded to fbi

director james comey decision not to charge hillary clinton in the latest round of her email scandal but said it is not put the troafersz to rest. >> hillary clinton will be under investigation for a long long time for her many crimes against our nation, our people, our democracy. likely concluding in criminal trial. >> reporter: earl rear in iowa thousands gathered for a noon rally in republican sioux city. >> we're doing great in iowa. remember's doing great in ohio. i think we're going to win pennsylvania. >> reporter: that was trump in tampa saturday morning. today five more stops. but all has not been calm. a protester at trump's rally in reno last night. >> we have one of those guys from the hillry clinton campaign >> was attacked by trump supporters, someone near the fracas shoutedded gun and the secret service whisked trump off

stage. there was no gun and prot tester was later released. trump came back to finish. >> nobody said it was going to be easy for us. >> reporter: trump's closing argument. >> we are going to drain the swamp. >> reporter: a pledge to turn washington upside down. >> real change begins with immediately repealing and replacing obamacare, a disaster. >> reporter: the promise of the demise of obamacare is now nearly as popular of trump's long-standing promise to build a wall on the southern border. and elaine, the message rings with an oddly advantageous ring here in minnesota, where the democratic governor mark dayton is frequently quoted by trump as saying, which he did, the affordable care act is no longer affordable. >> reporter: major garrett, thank you. >> quijano: here's where the presidential race stands tonight. the latest average of national polls shows hillary clinton

about two points ahead of donald trump. tonight our final battleground tracker poll before the election shows a dead heat in florida where the candidates each have 45% of the vote in ohio donald trump is one point ahead of hillary clinton, 46 to 45 percent. for more on this we turn to cbs news elections director anthony salvanto. >> reporter: elaine, one of the reasons behind these tightening races is that donald trump has gotten some more of the previously unsure, undecided voters in both of these states. now there weren't that many to begin with. but one of the things we've seen from these voters, as with many voters overall s that they have been looking for change to the political system. they don't think it works for them. well, what they tell us now is that they increasingly see hillary clinton as part of or connected to what they don't like about politics, but they say they see donald trump as entirely separate from it. so that could be one reason why they're moving over. the other is that partisans,

reliable republican voters who have not been as fully with donald trump through the campaign, as democrats have been with hillary clinton, some of those republicans have started to come back home, started to say they will vote for donald trump that is behind some of his movement. as we head into tuesday night, the key thing to watch is both of these states are critical to donald trump's path. he needs ohio, he needs florida. hillary clinton can win without them. the map would still favor her in that regard. but watch on tuesday f she request hang on to places like virginia, like pennsylvania, if she can hold both of those, she doesn't need a lot more to still get the electoral votes she'll need to get elected. >> quijano: anthony salvanto, thanks. anthony and the rest of our campaign 2016 team will be here tuesday night with full coverage of the election results it all begins when the first polls close at 7 p.m. eastern right here on cbs. you can also follow our election night coverage on our digital

network cbsn at cbs news.com. >> of course the world is closely watching the u.s. election. tonight manuel bojorquez gives us the view from mexico city, manuel? >> elaine there is great concern here that a trump victory could cause an economic shock and mexico's central bank is already exploring ways to try to mitigate that. one example, the peso. it goes down in value when trump goes up in the polls. >> of that has to do with his rallying cry against nafta the free trade agreement which includes the u.s. and mexico. trump says it is killing u.s. jobs and wants to do away with it. >> you are bringing in from the united states. >> i spoke with mexican business owners who say he is ignoring the fact that more than a million u.s. jobs depend on trade with mexico. >> there is a lot of. >> a mexican senator i spoke with said he is already drafting legislation that would seek to prevent the trump administration from making mexico pay for the border wall, one of trump's signature issues. >> the president and i will.

>> even before the election t has lead to a battle of words between trump and the mexican president, who invited the republican nominee to visit back in august. >> but the deep dislike of trump here in mexico goes back to the very beginning of his campaign when he labeled some mexican immigrants as criminals and rapists. that lead to protests here including the beating of trump-- and unflattering cartoons that are in the newspapers almost daily, all of that makes hillary clinton be heavily favored candidate south of the border, if only by defawment. elaine, the general feeling here is that donald trump has made this election personal for the people of mexico with much at stake for both countries. >> quijano: manuel bojorquez, thank you. a man was arrested near the whrowses saturday wearing a mask and carrying a gun. the man was confronted by secret service officer and taken into custody after a brief struggle. the president was not home at the time.

>> a south carolinaman accused of holding a woman chain inside a storage container for weaks was in court sunday. investigators say 45 year old todd kohlhepp kohlhepp has confessed killing four other people 13 years ago this weekend. is he a suspect in at least three other deaths. >> a police officer was killed sunday morning in west valley city utah. 25 year old officer code brotherson was hit by a car during a chase. he was outside his police car. three people are under arrest. >> the officer is survived by his parents, two brothers and his fiance. >> the colonial gas pipeline that burst into flames last week in alabama reopened today it carries gasoline from the gulf coast to new york city. it will be a few days before deliveries are back to normal. one person was killed and four others were injured when a piece of excavation equipment hit the pipeline apparently causing it to explode. at the vatican today pope francis had a special mass to

about a thousand prisoners from around the world. the pope said he wanted to bring a message of mercy and hope toin mateds and he called for improved living conditions in prisons all over the world. >> and a 20 year old runner from eritrea became the youngest man to win the new york city marathon sunday. ghirmay ghebresiassie pros crossed the finish line in just under two hours and eight minutes. among the women, mary keitany of kenya won her third straight new york city marathon. more than 50,000 people ran this year. >> coming up next, the challenges of covering campaign 2016-- 2016 in the classroom.

>> quijano: many teachers have been treading carefully in the classroom when it comes to talking about this area's election. some have changed lesson plans to avoid taking on some of the language and subjects that have come up. but mireya villarreal introduces us to one teacher without says no topic is off limits.

>> reporter: in this history classroom daniel jocz blends pop culture. >> did you know talking about immigration. >> reporter: and politics. >> i want to make them fall in love with the content of the study of history. and if you do those things, students are going to be very quick to want to learn and do amazing things within the classroom. >> reporter: joks says the day to day drama of this collection has captured the kid's attention but it has been an teunlt to teach both the strengths and weaknesses of democracy. >> we are going to build the wall 100%. >> we will not build a wall. >> i think you would do a huge disservice if you don't embrace it. these are teachable moments. there is real concerns about what this rhetoric means for their families, you know. will this turn into policy. and we constantly are are engaging in these conversations. we're not shying away from them. >> just because you have some people who do that does not justify for labeling and alienating an entire group of

people. >> roughly 80% of the school is high poverty from urban neighborhoods and most students parents are immigrants. >> trump doesn't know, right, he doesn't know. he doesn't support any of these with actual stats or actual researcher s. he just says it. >> sure there are some latinos that can make crimes but also some white people that can make crimes and joined by that logic you could also say oh, all white people are horrible people. >> in a report published by the southern poverty law center more than 40% of teachers d-- teachers surveyed said they were hesitant to teach about the election. and more than half have seen an increase in uncivil discourse. >> there is no toing off limits. >> none. jocz's goal is for students to really examine what the candidates are saying in the context of american history. >> how much of a gift has this been for your lesson plan over this last year. >> with almost been a gift in that it's very relevant to students, but it's also a curse because there is all these distractions. you can't help but kind of talk about these things that students

are hearing about or seeing in the news. >> reporter: still he says election day can't come soon enough. mireya villarreal, cbs news, los angeles. >> quijano: up next, high-tech bling, patrolling the u.s. mexico border.

>> quijano: along the u.s. mexico border an air war is under way between drug car tells and federal agents. chris martinez reports from the border in arizona. >> one of the most powerful tools to protect the border is suspended high above the arizona desert. agents call it their eye in the sky. >> we fly as close to 24/365 as we can. >> reporter: the tethers aerostat radar system tars covers the entire mexico border, six blimps from arizona to tech as carry specialized radar that can detect aircraft flying too low for conventional radar to see. that includes drones and these homemade low-flying planes smugglers use to deliver drugs

over the border. >> that is the control? >> yeah, this is the steering, just like a hang dlieder. >> agents say some aircraft are equipped with drop baskets like this so smugglers can dump their pay lod mid air to car tell members inside the u.s >> law enforcement operates that see that on the radar will then engage and get the drugs, get the bad guys waiting for the drugs. >> reporter: the tars radar images are sent to this military base in california where detection officers watch for potential threats. >> i'm going to zoom in and my focus is going to be for what doesn't seem right in this area. >> reporter: once something is spotted, border patrol teams can be in the air within three minutes. >> mexico's northern border right here. >> reporter: agents say smugglers often risk flying dangerously low to deliver their drugs. >> look you had close some will fly to these mountains. >> yes. >> they'll hug the mountains really close just to try to break up their profile. >> reporter: if a snuggler makes it over the border, agents

say the tars technology helps track down the drugs before it gets into the wrong hands. chris martinez, cbs news,iuma arizona. >> quijano: still ahead, we'll go swimming with drones.

>> quijano: when it comes to drones, the sky's not the limit. ben tracy shows us a new type of underwater drone that can turn anyone into an ocean explorer. >> reporter: it cuts through the water like a fish. and this remote controlled underwater drone can also turn on a dime. it's called tri dent and one of its createdders eric stackpole hopes it allows anyone to become an explorer. >> what are you hoping to accomplish? >> my hope is that we can get 10,000 more eyes in the water looking at parts of the world that no one has ever seen before. >> reporter: in the past exploration has always been something you see someone else do. it's always been the familiar ux

ux explorers who do their expedition and come back and show you what they found. >> reporter: undersea exploration began with jacque cousteau in the 1940s. >> here we go. >> reporter: in 2013 oscar-winning director james cameron designed and built a one-man sub to explore the deepest part of the pacific, nearly seven miles down. tri dent can only dive about the length of a football field, but that's deep enough to explore countless ship wrecks. >> they've been used to find ancient mayan pottery in underwater caves in mexico. in antarctica to explore under the ice. some people took them to mounted everest to explore one of the highest altitude lakes in the world. >> last summer he hadn't sent his drone into lake tahoe where they found the remains of a steamer ship known as the queen of the lake. >> we tully were able to land on the sink in this bathroom whrl in the 1820st in a ship wreck not seen for 70 years. that was just awesome.

>> reporter: we joined stackpole's team on a test run of the new mod elevator in montd ray bay on california's central coast. >> so what are we going to look for out here? >> so right now we are over a place called the metridium fields. >> they are large quite see anemones found about 60 feet down. while using her drone in 2014, laura james noticed sick and dying sea stars in her home near see at e8. she began documenting the devastation, scientists believe it's tied to climate change. >> when i look at the water i see not just the surface but the murky deep below. and i want to foa more about it. >> reporter: ben tracy, cbs news, monterey bay. >> when we return, cbs news legend walter cronkite and one giant leap for election coverages.

>> this past friday would have been the 100th birthday of the legendary cbs news man walter cronkite, tontd we look

back at one of the many highlights of his career. coverage of the 1952 presidential election broke new grounds in broadcast journalism. but as jamie yuccas shows you it wasn't always easy for thoses tv pioneers. >> a big election night, 18952. >> it was the first national broadcast of a presidential election. the 1952 race between dwight eisenhower and adlai stevenson. walter cronkite kite was in the chair. >> no state has been decided yet, general eisenhower is leading at this particular moment. >> it was the first time the network used a computer to predict the outcome of an election. >> this is not a joke or a trick. it is an experiment. we think it's going to work. >> newsman charles comingwood struggled to explain the uni vak, an enormous computer held miles away in philadelphia. >> on the right is the univac, something which looks like a type writer. that is the way univac talks. >> reporter: but not always on kreu.

>> can you say-- on cu e, can you say something, univac, do you have anything to say to the television audience, you are a he a very impolite machine, i must say. you have got a prediction for us, univac? >> reporter: the team also struggled with the early version of a hands free microphone. >> i will put on this gadget s that all right? >> for reporter doug edwards, it lead to be a on air mishap. >> excuse me. >> reporter: even with a few hiccups, the newscast was considered a triumph for cbs news, as well as for univac. >> he can remember 15 million digits or alpha bet kal characters. >> as the election swept eisenhower to victory, cronkite helped steer the nation into the start of the computer age. jamie yuccas, cbs news, new york. >> that's the cbs weekend news for this sunday. later on cbs, "60 minutes." the news continues now on our 24 hour digital network, cbsn as cbs news.com. i'm elaine key hand-- quijano in

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raider nation takes to the sky.. with a message for mark davis.. and the ci now at 6, it's the other big campaign in the bay area this weekend, raider nation taking to the sky with a message for mark davis and the city of las vegas. early voters waiting hours to cast ballots. how bay area poll voters are gearing up for the election day crush. heavy draw, a day after donald trump is rushed off the stage in reno. the fbi's october surprise turns out to be a november gift for hillary clinton. >> reporter: good evening. james comby told congress today his agency has reviewed all of hillary clinton's newly discovered e-mails and they have not changed his opinion that the democratic nominee should n