Voices heard in fierce election battle grounds. But is this legal . And sign of the times. Good electric fences make good neighbors. How one family is using shocking booby traps to keep intruders from capturing their trump flag. First tonight the nightline 5. Coke industries started in the heartland. Weve expanded to nearly every state. Today thats more than 60,000 american jobs. You may not always see our name on the proulks you use. But we help make better food, clothing, shelter, technologies, and other necessities. Here we build on each others ideas to create more opportunities for people everywhere. Together we are coke. And number one in just coming up in just 60 seconds. Everything you need to know about life, you can learn from granola. Keep it simple. Make every piece count. Let other people know what youre made of. Always be real. Dont be fake, dont be artificial, but always be sweet. And of course, wear sunscreen. Nature valley granola bars. No artificial colors, flavors or sweeteners. Just good. Good evening. Here we are at the tail end of the Nastiest Campaign anybody can remember and on the eve of perhaps the most consequential election of our lifetimes. With the polls showing a tight race, it all comes down to getting out the vote. But how do you actually do that . We are on the ground tonight with both sides in our series inside the final 30. Heres abcs david wright. Reporter dicksville notch, new hampshire, first to vote in primary season and first today. This time tomorrow, well all have followed suit. Our Long National nightmare over . We dont have to accept a dark and divisive vision for america. Reporter maybe. Were winning ohio. Were winning iowa. Were winning, we think, new hampshire. Reporter tonight, the candidates are crisscrossing the country. Our teams along for the ride. Were doing pittsburgh right now. The grand rapids, michigan, then philadelphia, and then north carolina. Were in raleigh, north carolina, about to walk into our second ral live the day. Here we go. Reporter the campaigns making their case in the states that they hope will put them over the top. This is our final day on the campaign plane, we just boarded this morning, were all getting nostalgia here. Reporter one final sprint to the finish. And a chance to get in some last licks. Shes a cheat. She is a cheat. She never reported it. Shes a cheat. Reporter true to form, this race brought lastminute surprises down to the wire. Including one final twist to the fbis review of Hillary Clintons emails. The fbi sent a letter to congress. It said it had reviewed a large number of emails and based on our review, we have not changed our conclusions that we expressed in july with respect to secretary clinton. In other words, remember that email investigation we reopened . Never mind about that. Reporter trump is now back to his old complaint. So totally rigged system. Ive been saying it for a long time. You cant review 650,000 new emails in a day. Our sources are telling us at abc, the fbi used computer programs and found that the emails between huma abedin and Hillary Clinton were duplicates. Reporter now its all down to the ground game. Hi. I am looking for teresa diaz. Reporter convincing the voters to do their part. In phoenix, andrew nystead spent the past month knocking on doors and he was out today. I took a few days off work to focus on this. Reporter if theres no answer, he leaves his calling card. Being the last day, every second is precious. So you cant wait around too long for them to come to the door. Reporter others are manning the phones. Hi names diana, a volunteer with the Arizona Republican party, how are you . Reporter diana brest cheerfully rallies the troops. Make america great, thank you, spread the word. Reporter that checklist all the trump votes shes logged today. Over 200. Youre a busy woman. Yes. Are you convincing them . Yes. Some of them dont even know election day is tomorrow. What . Yes. Can you believe that . Thats shocking. Reporter douglas greg has is having trouble keeping his emotions in check. Its for my grandchildren. Oh, wow. You feel that strongly . Oh, do i. We have been abused, im telling you. Reporter the stakes are that high for him. Campaigning is only part of how you win an election. The get out the vote operation, the doorknocking, and on election day having the machine on the ground to give rides to voters who may need it, thats traditionally how these races are won or lost in critical battleground states. Reporter new york city this weekend, a road trip for dozens of clinton volunteers. New york is solidly blue. Packed onto a bus, foot soldiers in this ground war. Were going to beat trump, yes. Were going to have our volunteers hand out some of the scripts. Not medical rise it word for word but know what im saying. All right, lets do it. Reporter chris danner and Kelly Stewart are not from philly. Were out here for the hillary campaign. Hillary. Yeah, awesome, thats the first question. Checking in with everyone. Making sure that theyre all set for tuesday. Reporter they dont get to vote in a battleground. But theyre hoping to make a difference by showing up here. Theres nothing really to do in new york right now. I mean, other than sit on your phone and stress out and freak out. Here theres a ground game. And the votes matter. That way . Two blocks. Its one of those moments in your life where Something Big is going on and you want to be a part of it. Reporter now in north carolina, a different brand of ridealong. Were on the trump train, baby. Reporter these folks are with the Great America pac. Floridas going to be close but hes going to take it. Reporter they call themselves donald trump dignitaries. Jesse jane duff, retired u. S. Marine corps gunery sergeant. We know hes going to win. Americas fed up. The clintons are the past, trump is the future. This is actually tide watch. Reporter dorothy woods, individual dough of a navy s. E. A. L. Killed in benghazi i hope they will take my experience and make their own decision about why she cannot be commander in chief. Reporter david clark jr. , a sheriff in milwaukee county. Donald trumps not beholden to anybody. When he goes to washington, d. C. Hes not going to owe anybody anything. Reporter its not always a friendly reaction. That mercedes, two up. He just shot me a bird out his window. Out his sun roof. There he goes. Thumbsup right there. Reporter the group rocks up to clemmons, north carolina. Trump, trump, trump, trump reporter all those people gathered for an event with the trump dignity tears the featured attraction. Weve got to push on now to get trump across the finish line reporter the enthusiasm here palpable. The dignitaries sign autographs i love your hat. And you even look better in it. Reporter and give smooches to trump supporters. Anything to get out the vote. Excited for tuesday . Reporter inside the event, one of our new friends turns on us. People are learning to rely on things other than just abc, nbc, and cbs. And i really dont want to make my friend from abc feel uncomfortable but the fact is the country is changing and the tides turning. Reporter crowd certainly turning on our producer. Abc is crooked enjoy it, relish it reporter as we get back on the bus, were all friends again. When i come here, it just touches my heart to see such enthusiasm. Reporter this long journey is almost over now. For the candidates too. Tonight on his plane, mike pence was wistful. When i think of this journey i think of long days and short runways. By gods grace, were come together end of an extraordinary experience. Reporter will the nation be happy where we end up . Back in arizona, andrew nystead has a few more doors to knock on. Do you feel like this is a big turning point . I do. In the country . Yeah, i really do. Either way . Yeah. Its a huge turning point. This is like 1776 or the civil war or something, you know, along that magnitude. Im not saying the worlds going to explode tomorrow or anything. But the ramifications of tomorrow will definitely be felt for a long time either way. Reporter tonight in dicksville notch, theyve already counted the early returns. This time tomorrow, everyone else will have their day. Im david wright for nightline in phoenix. Next, when social media and a heated election combine. The new app that allows something called voteswapping. Is this even legal . Later, a family going to shocking lengths to deter the theft of their trump signs. Simulation initiated. [beeping] take on any galaxy with a car that could stop for you. Simulation complete. The new nissan rogue. Rogue one a star wars story. In theaters december 16th. 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You can feel good about General Mills big g cereals. You can think of it as sort of a tinder for the election. Theres an app that allows you to ekt did with people in other states and swap your votes. Is that even legal . Heres abcs terry moran with more of our series inside the final 30. Get out and vote come out and vote reporter in the home stretch of whats become a razorthin election, both campaigns are out in full force. Their message . Every vote counts. Are you going to vote . Yes, i am. Reporter a message cecil weeks has taken to heart in a surprising way. Who are you going to vote for . Jill stein. Do you support jill stein . I support hillary. Reporter cecil is putting democracys most precious gift, his vote, in the hands of a complete stranger. Why are you voting for jill stein . I can help thirdparty supporters legitimize third parties by voting for their candidate in my safe blue state of new york, and they can help me out in a swing state and vote for Hillary Clinton. Good spirit and trust . Reporter its called vote swapping with the help of an app called nevertrump, cecil will vote for jill stein in new york, his swap partner says shell vote for clinton in arizona. I feel like im making a bigger difference than i than in new york. Reporter for the race for the white house neck and neck in some states a fourpoint race reporter thirdparty candidates have the potential to sway the outcome. And so voteswapping options like never trump, trump traders. Org, and vote pact. Org, help some voters redefine how their vote counts. You dont have to worry about the fact that your thirdparty vote in a swing state could make trump up to date. You get to have your vote somewhere else and hillary gets another vote ensuring a trump win doesnt happen. Reporter the never trump app is the brain child of Silicon Valley ceo ahmed kumar. Despite the name of the app, he says its more about the democratic process than the democratic kab iic candidate. People in deep blue or deep red states realize their votes dont matter as much. If theres a way for you to have that vote count, the participation rate, the citizenship, will be more activated. Reporter it might seem hard to believe, but voteswapping is actually legal. Voespairing is perfectly constitutional and legal and its heartland First Amendment expression. Reporter its not a new idea. Maryland state senator jamie ras kin proposed vote swapping in 2000 to help Green Party Candidate ralph nader get enough of the popular vote without taking votes from al gore. I was trying to figure out a way that progressives could get behind al gore and give him votes where he needed them, but in return, nader could get votes in safe red states. Reporter voteswapping websites popped up but they were called into question. A number of republican secretaries of state and attorneys general sent threat letters to the operators of the websites saying that they were engaged in an illegal votebuying conspiracy. Which was ridiculous. They shut the websites down. Reporter but a lawsuit followed and finally, in 2007, it was decided that votetrading is totally kosher, as long as no money or anything else of value trades hands. A lot of talk about how ralph nader might do reporter the socalled nader effect, when just a few votes for a thirdparty candidate can make a difference, had already happened. Lets talk about that extremely tight 2000 election and how voteswapping could have impacted the race. Bush, gore, nader. In florida only 537 votes separate al gore and george bush in the state of florida. If those 537 voters swapped their vote with people in a safe blue state, al gore could have possibly won florida and then the presidency. Reporter not wanting to repeat the past has brought new jerseyen joel and Floridian Carrington together. Joel, a hillary supporter, is writing in Bernie Sanders for carrington. In turn, she votes for clinton. It seemed like it would give me a way to still allow my voice to be heard. But in a different state. And at the same time prevent trump from taking florida. Reporter the approach relies on the honor code and a little investigative work. I looked at joels facebook. I saw that he was a real person. I saw he had antitrump posts. He was pretty liberal. And i decided, okay, this guys the real thing, hes not going to screw me over and vote for trump. So you guys have established trust here in a nasty campaign, its actually kind of refreshing. Its definitely an honor system. Its totally legit. Its not illegal. Reporter but a lot of people died for the right to vote over the years. Right. Reporter do you feel like youre gaming this a little bit . I could see how people would take it that way. But personally, i just feel that im using my vote the way it was intended to be used. We can make history. Reporter can voteswapping really affect the outcome of the election . We have to remember its a very small percentage of the public engaged in this kind of voting behavior. But if the race is as tight as some polls show, voteswapping and thirdparty voters could absolutely impact this election. Reporter still, a lot of people dont know voteswapping is a thing. I dont really understand how it could possibly work. Reporter and others see it as a way just to game the system. Your vote is your vote. Thats your vote. And that should be your vote, not somebody elses vote. Reporter but if cecils any indicator, technology and democracy will likely only continue to collide. I think its democracy at its best. I think its a really nice way to work thing s when you feel like your options are limited. If Hillary Clinton wins arizona by one vote, were going to do an interview. Im sure theres lots of people coming to see me. Reporter for nightline im terry moran in new york. Next, a trumploving family setting up a rigged system in their own front yard. Shocking anybody who would steal their trump signs. My hero zero. Such a funny little hero but till you came along we counted on our fingers and toes now youre here to stay and nobody really knows. Zero really can be a hero. Get zero down, zero deposit, zero due at signing, and zero first months payment. On select volkswagen models. Right now at the volkswagen sign then drive event. And let roomba from irobot help with your everyday messes. Roomba navigates your entire home. Cleaning up pet hair and debris for up to 2 hours. Which means your floors are always clean. You and roomba, from irobot. Better. Together. With another new flavor you never saw coming. Grilled, glazed korean bbq shrimp. 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We started with a smaller one that people were crushing with the signs in it and stealing the signs. And we installed a camera, got a couple of pictures of people. Reporter eventually they added this electrified fence. If they even touch the sign theyre going to get zapped. Reporter their son says he witnessed a thief. He stopped in front of the sign, got out of the truck, got the sign and drove away. Reporter in texas in michigan its Hillary Clinton signs as well. I think the amount of yard signs being stolen is reflective of the amount of enthusiasm thats out there. Reporter back in new jersey what do your neighbors think of this . I spoke to one guy, a little bit of a liberal. I said we have our trump signs in a dog pen and he said, thats where they belong. Lets hope all the signs can stick around a few more hours until election day. We wish all of you as much sanity as you can muster over the next 24 hours. Thank you for watching abc news tonight. Keep it here on abc. Well be live all night tomorrow night with all of the latest election coverage. Thanks again for watching and good night