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The president spent the day in dallas, comforting the nation after the Deadly Police ambush there. A tragedy made all the more chaotic in the moment for Law Enforcement by the presence of armed protesters. Texas is home to the controversial open carry Texas Movement whose members walk around in public with their guns on full display. My nightline coanchor byron pitts goes inside the group for our weeklong series america in black and white. Glory glory hallelujah reporter today the city of dallas taking time to mourn. Gathering to remember the lives of five officers killed in last weeks horrific attack. Putting politics aside, president obama and the first lady, hand if hand with former president george w. Bush and first lady laura bush. The president delivering a sermon of sorts. Im here to insist we are not as divided as we seem. And i know that because i know america. I know how far weve come against impossible odds. Reporter his poignant observation that in the audience, mourning of all sides. I see people who mourn for the five officers we lost, also weep for the families of alton sterling and fill lawn dough castille. I see whats possible when we recognize we are one american family. Reporter thousands having paid their respects over the last few days. These squad cars outside Dallas Police headquarters. A mill shift memorial filled with messages of hope and loved. The 11 injured and the families of those killed in the line of duty. This is very humbling. Reporter drawing visitors from all walks like First Sergeant c. J. Grissom, gun advocate and founder of open carry texas. He came to dallas to pay his respects. Its good to see that we can still come together when we recognize that what happened should not have happened, regardless. Reporter his group an eclectic mix of gun enthusiasts who pack heat in public. My ability to carry a rifle in selfdefense should never be infringed upon. Fy choose to defend myself with a ak15, a derringer, it doesnt matter, the Second Amendment is a selfdefense tool. Reporter in a city still on edge the sight of exposed guns causing fear and concern. It feels unnecessary to me. Like concealed i understand. But that is just excessive. I dont understand the point. Reporter texas is an open carry state. And Walking Around like this is legal. In the last few days their actions have drawn criticism. They will make an issue out of it, flip you off. Reporter here at last weeks black lives matter rally, 20 to 30 men were seen with rifles strapped to their backs, wearing gas masks and bulletproof vests quhr shots were fired, confusion. About who was responsible and how many shooters. This man carrying an ar15 identified as a suspect. The dallas pd tweeting, this is one of our suspects, please help us find him. Mark hughes turn himself in to police. He was later cleared and released. Immediately i flagged down a Police Officer. He was allowing himself to carry an arm, a firearm, but thats his constitutional right. Reporter Dallas Police chief david brown said open carry laws blurred the line between potential suspects and the marchers. When people have ar15s slung over and shootings occur and crime and they begin running, we dont know if theyre a shooter or not. Its easy to tell who the bad guy and the good guy is. The good guy has his rifle on his back, not pointed at you firing. Reporter christian as 20year army veteran and father of three. In combat i had no problem discerning who was the enemy, and everybody had guns. All it takes is a little bit of analysis and good training. Reporter he may be critical of police but hes not quick to support movements like black lives matter. Whats wrong with the black lives Matter Movement is that were minimizing the other people who are being killed by Police Officers unjustifiably. Reporter grisham says like alton sterling and Philando Castil castille, hes been there, under an officers gun, fearing for his life. He says this traumatic event in 2013, caught on Police Patrol dash cam, was the spark that ignited open carry texas. I was arrested. My son and i were going on a hike reporter grisham said he brought that rifle strapped across his chest to protect them from wild animals. Halfway through our hike a Police Officer approached. Some reason why you have this . Because i can. Reporter since carrying a rifle is legal, even without a license, christian believes what happened next was illegal. Hey, dont at that point he pulled his gun, stuck to it hi head, threw me into the car. Reporter his son chris videotaped the arrest also. The father charged with interfering with a Police Officer and taken to jail. Im going to do everything you say. My son had to watch this whole thing. Reporter when we first met grisham two years ago he told us he was still battling the demons from tours in iraq and afghanistan. The arrest, his first time in jail, he said, triggered one of the worst episodes of ptsd hes ever endured. Ive always been a gun rights advocate. But this turned me into an activist. How long are you keeping me in jail for . Reporter grisham walked away with a mission, a movement born. A goal to expand open carry right in the state of texas. At the time it was only legal to openly carry socalled long guns like ar15s. State law prohibited the open carry of handguns. But just last year the law passed, giving texans with a permit the right to open carry handguns. While fighting for those gun rights in 2014, grisham invited me along to a rally in san antonio. There are folk in the country you are scaring. I realize there are people that have what i call an an irrational fear of guns. Reporter he stressed the fact that he always calls ahead to alert police about their marches. We met nearly two dozen wellarmed supporters from retirees, children, men and women, gun lovers of every race. So often when these events are covered by the media, i may see this gentleman, i may see that gentleman, but i dont see you there. My house was robbed by five guys about four months ago. The police did nothing. So therefore i think its my duty to protect my family. Reporter open carry members passing out fliers in one of san antonios busiest intersections. Most motorists are supportive. But some what do you think of these guys . [ bleep ] what do you think . Im a journalist, im getting opinions. Run away even if you took all guns away, if guns had never been invented, people still commit evil against other people. Theres more People Killed by hammers and clubs and fists than by firearms. Actually, the latest fbi data shows firearms are responsible for 68 of homicides in this country. Clubs and fists, 9 . But americas gun debate is far more than statistics. Its emotion. Its culture. Horrific headlines, mass murders that can easily be explained away. From dallas to orlando. And in baton rouge. Last week i encountered another open carry advocate outside the triple s mart where alton sterling was shot and killed by police. Tell me the weapons you have with you and why. Here a sub compact glock 4. This is ar15 pistol. Why is it necessary to walk around . Its not necessary. One of the reasons i do it is education. A lot of our youth feel they may protect themselves. In a lot of cases they may get weapons that come off the street or Something Like that. Not knowing that they can have a weapon thats legal. Reporter gun control advocates and some political leaders strongly disagree, saying more guns is not the solution. We flood communities with so many guns that it is easier for a teenager to buy a glock than get his hands on a computer or even a book. Reporter and with the Republican Convention ahead in ohio, a state with no open carry regulations, tensions are high. Some worry about visitors and protesters bringing firearms to the city. For nightline, im byron pitts in dallas. Up next, which one is the real Kim Kardashian . And thats not bradley cooper. The bizarre doppelganger phenomenon. How to find your lookalike. Take on any road with intuitive allwheel drive. The nissan rogue, murano and pathfinder. Now get 0 apr for up to 72 months, plus 500 bonus cash. But zzzquil is different have Pain Medicine because why would you take a Pain Medicine when all you want is good sleep . Zzzquil a nonhabit forming sleepaid thats not for pain, just for sleep. And who doesntb then seize the day already. Crabfest is back at red lobster with so many kinds of crab and the most crab dishes of the year. So dive into whatever floats your crabloving boat. Like crab lovers dream. Crack open tender snow and king crab legs, and twirl creamy crab alfredo. Or try the new alaska bairdi crab dinner. Sweet and straight from the icy waters of alaska, youve gotta get it. To really get it. But it wont last forever, so hurry in. So guys with ed can. Take viagra when they need it. Ask your doctor if your heart is healthy enough for sex. Do not take viagra if you take nitrates for chest pain or adempas® for pulmonary hypertension. Your Blood Pressure could drop to an unsafe level. To avoid longterm injury, seek immediate medical help for an erection lasting more than four hours. Stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. Ask your doctor about viagra single packs. Whats with them . Oh, those two . Theyre always fighting for attention. Theres more to a legendary city than its legends. Plan your legendary stay at visitphilly. Com know someone who could be your identical twin. Well, you might just have a doppelganger, a perfect strange history could pass for a twin separated at birth. Heres another look at a way to help you find out with a few clicks of the mouse. Are you two twins . Reporter meet maddy and amber. The pair look like twins. But believe it or not, theyre complete strangers. No, were not even related. No, youre kidding me. Reporter theyre doppelgangers, a mysterious phenomenon in which two people look nearly identical. Sometimes theyre entirely unrelated. Who can forget these bearded redheads who found each other on the same plane . Even celebrities. Adam sandler met his done bell banger on the red par pet, inviting him to the premiere of the doover. Kim kardashian has possessed with a selfie with her doppelganger. It isnt all glitz and glam more. Mario looks so much like shia labeouf, he was punched in the face. Folklore has it we each have seven lookalikes in the world. This dublin native is looking to prove that theory. These already met three of her own doppelgangers. Oh my gosh, this is crazy. Reporter he very first meetup went viral and has been viewed more than 8 million times. Since then, niamhs been a doppelganger detective of sorts. Cofounding the website twinstrangers. Com. To help others in their search. I think people want to find their twin strangers out of curiosity. Its not a burning desire to find someone who looks like you, its more like, oh yeah, that would be interesting, that would be fun. How many matches have you been able to make . We have over 1 Million People registered at the website. And its growing every day. We have thousands of matches. Reporter she shows us how the matches work. This is twin search. These are all the people who have selected the exact same facial features. I see. Reporter nimah is bringing people together from all over the world to meet facetoface. I signed bun a month ago. Reporter shannon from ireland and sarah from sweden. Hi oh my god. Oh my god, you look just like me. Its my twin sister. Reporter here in the u. S. , ambra and jennifer meet for the first time in houston, texas. Twin strangers. Bond very quickly because theyre looking at a face theyve been looking at their whole life. Its familiar to them. I live in tacoma, washington. Im from perth, western australia. Reporter we wanted to see the doppelganger bond up close and personal. Nightline paired up with twinstrangers. Com to go behind the scenes of one of their meetups. Brigham bear frringing amber fr perth, australia, and maddy from tacoma, washington, to l. A. Even i was confused. Hi. How are you . Hi youre double trouble. Nice to meet you. Nice to meet you. Im amber. Im maddy. Amber, maddy, you guys are adorable. Nice to meet you. Whose idea was the purple . Maddys. Me. First reaction when you saw the photo of each other on the site . I never really met anyone that looked like me. So seeing her picture is kind of weird. That was the first time id ever seen anyone that even looked remotely similar to me. Much less dead ringer. Yes. They sent me a photo of maddy to ask if i thought we were similar. And the top half of her face started loading and i thought it was a picture of me. Then the rest loaded and i was like, wow, thats insane. What piqued your curiosity . There are an equal number of people thinking, no, i would never want to meet somebody like me. Just thought it would be fun, why not. See if theres someone thats out there. Fun, not creepy . Right, yeah. Yes, i thought it was fun. Were there any freakout moments . Moments where we go to do the same thing at the same time. Like brush our hair. Take a bite of food tame. When we were eating breakfast together, everyone freaked out because we ate something the same way. Like twins separated at birth. Yes, maybe. Tell me a little about what you do for a living what background if. I cut hair for a living. I learned some make nun cosmetology school. Thats what she does. We graduated the same year. You have the same laugh. Now were trying not to laugh. Reporter they spent the weekend together sightseeing in l. A. Their boyfriends tell us at times even theyve been confused. You guys look like twins. Absolutely. Were related almost. Its crazy. What was the reaction . Gut reaction . First thing, oh, crap. Yeah. Youve got to really know who from behind you dont even get it. At first, you know, it was all about the looks. Then after hanging out with them a few days, its more than just the makeup, its more than just the hair. They start doing things in unison. Its kind of like, okay, stop. Right . Are you doing that on purpose . Reporter we wanted to see if theres a genetic reason for their similarity records we asked amber and maddy to take a dna test that ancestry. Com agreed to process for free. In just a few weeks the results are in. Guess what . They are 100 not related. But they do have similar european roots. Despite the results, they say their newfound bond will only grow. Up next, a hatchet is officially buried. Can those feeling the bern really get behind hillary . Im free to do what i want and have a good time. The ford freedom sales event is on and zero for 72 is back on 2016 ford focus, fusion and escape. Plus specially tagged vehicles get an extra 1000 smart bonus. That means freedom from interest. And freedom to choose. With ford, americas best selling brand. Im free, baby now get 0 financing for 72 months. Plus, specially tagged vehicles get a 1000 smart bonus. Only at the ford freedom sales event. Feel free. When you dont get enough and your body aches. Youre not yourself. Tylenol® pm relieves pain and helps you fall fast asleep and stay asleep. We give you a better night. Youre a better you all day. Tylenol®. Be quicker than everybody. Allyson felix needs to. To win at home, she needs to be quicker than. Allyson chloe thats why Allyson Felix uses bounty. 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I dont believe that she is qualified. Reporter one where he accused her time and again you know excuse me, im talking. Reporter of embodying the cancer at the heart of american democracy. Our average contribution is 27. I am very proud of that. Reporter today these two democrats set all that rancor aside. We accept 27 donations too, you know. Reporter the most recent abc news poll found that three out of four sanders voters say they will vote for clinton. But today donald trump tweeted, Bernie Sanders endorsing crooked Hillary Clinton is like occupy wall street endorsing goldman sachs. The question now, will bernies voters agree . Im david wright for nightline in new york. The ultimate, if you cant beat em, join em. Thanks for watching abc news. Tune into good morning merge. As always were online at abcnews. Com an