>> reporter: through the republican convention last month, the state of the race had some americans praying for divine intervention. are you excited? are you apprehensive? >> i want jesus to come before the election. >> reporter: but now -- >> good afternoon, wisconsin. >> reporter: with kamala harris as the democratic nominee, the share of voters who say they are enthusiastic about the race have jumped almost 40 points, and republican excitement has been flat. talk to voters as we did on a stroll along chicago's navy pier, and the joy of the moment often sounds a bit more complex. >> you're fine. >> you're fine? >> i'm not excited one way or another. >> reporter: inside the billy goat tavern conference, this democrat was fired up less about harris than about change in general. >> somebody's got to step up to

keep donald trump from being president. >> reporter: so you're excited it's not joe biden? >> yes. >> reporter: and not far away, some republicans made it clear they too had been feeling more engaged, at least until recently. >> this version of trump seemed in the debate, much more together. he seemed much more on topic. he seemed like he was focused on policies rather than trying to just, like, make fun of somebody. >> right. >> i think he's a little more sophisticated politician. so that i was excited about. >> how do you feel about him now though? >> i think actually since the biden dropout, he's losing -- he's, like, losing his focus. >> reporter: in addition to worries that harris has knocked trump back into cycle of insult politics. >> i'm a better looking person than kamala. i don't think she's a very great person. >> reporter: some fear she's got a gender appeal he simply can't match. >> i'm worried that people would just vote for her because she's a woman, and that doesn't make me happy.

>> reporter: and if you think that sounds unlikely, think again as harris supporters repeatedly told us they're motivated by what's historic about her candidacy. >> i really want her to win as she would be the first president as a woman. we need change. >> she's good change. and we're behind, like, mexico already has a woman president. we're behind. we got to get with the times. >> reporter: and then there's these two out celebrating their wedding anniversary, in a small wave of black voters. moving away from the democrats. >> we want trump because we want the stimulus check. >> really? >> i want trump. >> wow. >> reporter: now a new name at the top of the ticket means a new vote for some. >> i would vote for her just because she's a black woman. i'm just going to vote for her. i didn't even look her up or nothing or none of her interviews yet. >> why is that so important to you? >> just because there's never

been a black woman in office. >> reporter: but above all, for democrats anyway, what matters most is clearly not the candidate or the platform. it's the results on election night. >> i don't think joe biden really had a chance of beating donald trump. >> yeah. >> but i think kamala harris has a hell of a chance to beat donald trump. one of the most dangerous jobs in law enforcement is carried out by u.s. marshals tracking down wanted fugitives. in april, four members of a marshals task force were killed on a mission in charlotte, north carolina. nicole sganga got rare access to the training facility and spoke with the agency's director. >> reporter: on a military base in rural pennsylvania -- >> drop the gun. >> reporter: -- high intensity survival training for america's oldest law enforcement agency. amid a spike in violent encounters. would you consider this one of the most dangerous jobs in law enforcement?

>> oh, absolutely. >> reporter: developed by brett hall of the u.s. marshals training division, back to back drills, stress test officers. >> we are having to make these deciions in fractions of a second, and that's what this course is, evaluate their decision-making skills under stress. >> seconds matter. >> exactly. >> reporter: simulating potentially life-threatening scenarios. >> how did you feel about your heart rate, your breath rate? >> reporter: instructors track their heart rates in realtime. i see this person is in the red here. >> we're getting up there. >> reporter: conditioning for the fugitive task force, the team of officers serving hundreds of warrants every day to some of america's most wanted. it's called human performance training, but deputies have another way of putting it. >> it's a good opportunity here for us to train for that bad day. >> reporter: just months ago, the agency marked its worst day in over 150 years on april 29th. four officers gunned down while

trying to arrest a dangerous fugitive including deputy marshal thomas weeks. >> he was one of a kind. >> reporter: it was hall's roommate through basic training. >> he was energetic and intense. >> reporter: the suspect fired an ar-15 rifle from his second-story window, 1 of 13 mission this is year where marshals came under fire. >> this came down to battle. this came down to honor. >> reporter: ronald davis is the 12th director of the u.s. marshals service. you don't see this as a failure of training? >> oh, no. absolutely not. >> reporter: one surviving deputy told davis after the first officer went down, he could not leave him behind. >> he looked at me and he said -- he said, director, i could not leave him on the x. think about that. he's responding knowing that he's still under fire, but he could not leave him in the field. >> reporter: that bad day now one of the most scrutinized.

>> we would examine this from a to z. we will try to learn anything and everything that we can. >> reporter: and a painful reminder that even the toughest physical conditioning cannot prepare officers to heal emotional scars. >> we've got to take care of each other. >> reporter: back in training, hall now teaches emotional survival 101. >> i'm dedicating this class to tom and his crew, and that we as a group here will dedicate that it will not be in vain. >> reporter: a class designed to help officers cope with grief as they honor the fallen. nicole sganga for indian town gap, pennsylvania. a lot of people say th hey, i just got a text from my sister. you remember rick, her neighbor? sure, he's the 76-year-old guy who still runs marathons, right? sadly, not anymore. wow. so sudden. um, we're not about to have the "we need life insurance" conversation again, are we? no, we're having the "we're getting coverage so we don't have to worry about it" conversation.

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-right? -mmm-hmm. talenti. raise the jar. a lot of people say the biggest reason they'll never buy an electric vehicle is range anxiety. that's when you don't know where you can charge up when a battery runs low. los angeles now came up with a possible solution. just plug into a light pole. david schechter has more. >> reporter: when you are in california doing a story about electric cars, you have to rent an electric car and go for a cruise. ♪ 10 miles an hour on the freeway, not exactly what i had in mind. unlike the speed of traffic in los angeles, the sale of electric vehicles in the u.s. is really moving. last year, americans bought 1.4 million of them. more electric vehicles means fewer greenhouse gas emissions that warm our planet, but

there's a downside. there are not enough publicly available electric chargers to juice all those cars up. >> so i've got an app. i'm going to find us a charger. >> okay. >> reporter: that means in california, the state with the most evs, finding a charger that's working and also available -- >> someone's in it. >> reporter: -- can be a challenge. >> they're all in use. it's definitely blocked. there are no chargers here. >> reporter: one of the ways to address the gap is better maintenance. >> chargers to refuel your vehicle is inoperable. >> that's a problem. >> that's a problem, right? that's a huge problem. >> reporter: walter thorn is with a small company called charger help. they service a variety of charging equipment owned by different companies and frequently techs discover that a charger is out of order before the charging company even does. the pain is real.

jd power found that 35% of drivers visited a charger where they were unable to charge. in denver and dallas, that number was 29%. other research found 28% of the chargers in the san francisco bay area did not function properly. charger health developing a new standard that says chargers have to work 97% of the time. >> we know that reliable charging infrastructure is a critical piece of a successful transition. >> right there. you see the sign? >> i'm on the map, but it's not on the map. i'm lose a little bit of patience right now. >> reporter: federal lawmakers approved $5 billion to spur the construction of a national network of 500,000 publicly available charger ports by 2030. that would help fill the gap, and there's been a lot of plans, but few chargers. >> how's it going? >> reporter: melissa lotte is an expert at columbia university.

>> you have to pick certain places and make sure the infrastructure behind it, all the stuff that's invisible to us on the day-to-day is actually there and ready to go, and that takes time. >> reporter: to keep up with growing ev sales, experts estimate in addition to all the private chargers at homes and offices, the u.s. will need 1.2 million publicly accessible chargers by 2030. today there are about 160,000 which means they will have to build the equivalent of what we have right now every year for the next six years. lotte says when it comes to climate change, there's a lot riding on quickly building out a national charging network. >> the slower we go, the bigger the impacts of climate change that we're going to see. >> reporter: the city of los angeles is taking a novel approach to closing the charging gap, installing chargers on light poles on city streets because the electric

infrastructure, it's already there. >> at most, we'll have to change fuses or do structural things. >> reporter: this is the director of l.a.'s bureau of street lighting. so far his team has installed about 725 light pole chargers and says the city's street lights can support a total of 3,000 or 4,000 more. >> we're going to be that public option for people to have access on it to have the right of way. >> i think we should go back over there. >> charger. >> we're charging, baby. i'm david schechter. there's a lot more just ahead on "cbs news roundup". stay with us.

tina zimmerman: five years ago, i reconnected with my estranged father, and that's just something i never ever thought could happen. but when he became a believer, he just had this insatiable appetite to learn the bible, and he began to watch dr. stanley. dr. stanley: god always blesses obedience without an exception. tina: he teaches in a way that it just makes sense, and i feel like that's the way our heavenly father would teach us.

the hunt is on in the florida everglades for an invasive species that's decimated the local wildlife.

giant pythons. some of them up to 20 feet long. there is a whole department dedicated to hunting them, but for a few weeks each year, amateur hunters join a quest for cash. christian benavides has more. >> if they're coiled up under this 3 or 4 inches of dpras right here, you would never see it. >> reporter: the dead of night provides cover for the predators lurking in the marshlands and swamps of the florida everglades. >> how's it going? >> reporter: donna is out hunting. >> there's a lot of competition out here. >> reporter: she's among 820 million participants in the hunt for the burmese python to remove the invader. the reward, $25,000 in cash prizes. does it actually make a difference? >> every python removed from the system makes a difference. >> reporter: mike kirkland runs the hunt and the python elimination program.

it employs 100-year-round hunters including khalil. but is it a losing battle? >> are we winning it right now? perhaps not, but i'm optimistic about our future. >> reporter: pythons were imported from south asia as exotic pets. officials say owners let them loose in the everglades when they grew too big, and the python population exploded in the 1990s, ravaging wildlife. the everglades' rabbits, and even birds have fallen prey. >> the ecosystem collapsed here. >> you want to make sure to keep that snake on the ground. >> reporter: this man trains participants on catching and killing pythons. >> the scope of this problem is so big we can't do this alone. >> reporter: pythons thrive in warm climate which is why they quickly adapted here in the everglades, and they're spreading. milder winters have led to sightings further north. this usgs map shows the python spread across south florida, a tusk university study finding climate change could make the entire continental u.s. hospitable by 2030. >> i'm afraid it might get away. >> reporter: over 14,000 pythons

have been eradicated, but the big snakes are so successful at adapting to florida, they appear here to say. christian benavides, cbs news, the everglades. >> and important to mention pythons are not poisonous and there's no record of one ever eating a human at least not in florida. no snake hunting for me. that's today "cbs news roundup." for some of you the news continues. for others, tune in for "cbs mornings" and follow online any time at cbsnews.com. reporting from the cbs news broadcast center in new york city, i'm shanelle kaul. ♪

hello, and thanks so much for staying up with us. i'm sheinelle call in new york. tim walz grabs the stage and his party's nomination at the democratic national convention. in his first outdoor rally since an attempted assassination, donald trump appears from behind bullet proof glass, and rescuers searching for survivors of a superyacht that sank off the coast of italy make some new discoveries. on night three of the democratic national convention, minnesota governor tim walz formally introduced himself to the nation accepting the party's nomination for vice president. he shared the stage with a slew of democratic heavyweights and hollywood a-listers. cbs's skyler henry covered this

all from the convention floor. >> reporter: minnesota governor tim walz stepped into the spotlight on the third night of the democratic national convention, formally accepting the nomination to serve as vice president kamala harris' running mate. >> so go ahead. stay it with me. we're not going back. [ chanting ] we've got something better to offer the american people. >> reporter: chicago's own oprah winfrey made a surprise appearance pledging her full support to the harris-walz ticket in her first time speaking at a political convention. >> let's all choose kamala harris. [ cheers and applause ] >> reporter: former president bill clinton also spoke warning democrats to avoid overconfidence. >> we've seen more than one election slip away from us when we thought it couldn't happen. >> tonight is considered governor walz's debut on a

national stage. he was a relative unknown about a month ago, but a cbs news poll finds about 60% of voters say they're enthusiastic about him. highlighted his upbringing in a small nebraska town, his service in the army national guard and his work as a high school teacher and football coach, work that led him sending him to congress at the minnesota capital. kenan thompson hosted a game featuring delegates. ♪ musicians john legend, marrin morris, and others kept the party going on the floor. ♪ tomorrow, harris will cap off the dnc with a speech and accept her party's nomination for pres president. skyler henry's cbs news, chicago. and our coverage of the fourth and final night of the democratic national convention in chicago continues thursday evening at 5:00 p.m. eastern on

cbs news 24/7 and on cbs at 10:00 p.m. eastern. former president donald trump continues campaigning during the democratic national convention holding a rally wednesday in north carolina. he went on the offensive after being openly attacked by the obamas at tuesday night's convention. it was the former president's first outdoor rally since he was wounded by an assassin's bullet last month in pennsylvania. cbs's scott macfarlane has more. >> reporter: a wall of bullet proof glass surrounded the podium as former president donald trump addressed a crowd in the city of ashborough 90 minutes from charlotte, checking on a person having a medical issue. snipers were seen on the roofs of the venue and storage containers were stacked for added security. featuring trump and his running mate, senator jd vance, part of an effort to slow a surging vice president harris who's cut into trump's lead in north carolina.

>> she ruined san francisco. she ruined california, and if she gets in, our country doesn't have a chance. >> reporter: trump also took aim at the obamas after their dueling attacks on him in chicago. >> did you see barack hussein obama he was taking shots a itt your president, and so was michelle. >> his limited view made him feel threatened by two highly educated, successful people who happen to be black. [ cheers and applause ] i want to know. i want to know. who's going to tell him -- who's going to tell him that's the job he's currently seeking, that it might just be one of those black jobs? >> it has been a constant stream of gripes and grievances that's actually been getting worse now that he's afraid of losing to kamala. there's the childish nicknames,

the crazy conspiracy theories, this weird obsession with crowd sizes. i -- it just goes on and on and on. >> reporter: scott macfarlane, cbs news. well, the political future of independent presidential candidate robert f. kennedy jr. is now looking more uncertain. kennedy has scheduled a speech for friday to discuss, quote, his path forward. the announcement is fueling more speculation he will drop out of the race for president. this week, kennedy's running mate nicole shanahan spoke openly about the possibility of joining forces with the trump campaign. there were grim scenes in southern italy as the bodies of several people who were aboard that megayacht when it sank on monday were brought ashore. five of the six victims have now been found. get

we get the latest on this story from cbs's holly williams. >> reporter: divers found five bodies in the wreckage of the super yacht. one is still missing. an underwater drone is helping the search. the luxury yacht over 180 feet long, went down early monday morning about a half mile offshore near the village of port portacello. authorities believe the yacht may have been hit over the water known as a water spout, though that isn't confirmed. 15 people were rescued, but amongst those who apparently didn't make it to safety was mike lynch along with his american lawyer and his wife. we still don't know why the yacht sank. according to matthew shank, a maritime expert -- >> there was a significant weather event. >> reporter: other yachts in the area at the time didn't go down. is that surprising? >> yes, it is. that says to me this was an

extremely localized event that happened, which again, would have been caused by a water spout. >> reporter: italian prosecutors are reportedly already questioning survivors to determine exactly what caused the yacht to sink. it is not a criminal investigation. holly williams, cbs news. in texas, nearly 25 million people are under excessive heat warnings or advisories with temperatures in the triple digits. del rio had its hottest august day ever hitting 112 degrees on wednesday while san antonio and austin both had their hottest day of the year breaking records at 108 and 109. straight ahead on "cbs news straight ahead on "cbs news roundup," democrats are riding hall of fame defensive back, darrell green, for health playbook. i'm with 2018 lacrosse national champion kristen gaudian, for the fda's don't get burned sunscreen challenge. ready for a little one on one?

bring it, darrell! hey, she's tough, but i won't get burned today. i'm using a broad spectrum sunscreen with an spf of 30. the fda recommends broad spectrum sunscreens with an spf of 15 or higher with other sun protection measures to reduce the risk of sunburn and skin cancer. reapply sunscreen every 2 hours while outside and more often if swimming or sweating. you smoked me, kristen. you know i was the nfl's fastest man! that's why i used a sunscreen with an spf of 50, so i wouldn't get burned by you and the sun. great game plan! you just won the fda sunscreen challenge! broad spectrum sunscreen is a winning play every time. for more information on sunscreen and other sun protection measures, go to fda.gov/healthplaybook after my wife died, it was like i lost myself, too. i didn't feel like doing anything or seeing anyone. then my granddaughter called to say she misses me. and i realized, i had to make a change.

i got referred to a psychiatrist and she explained depression can happen to anyone. i'm learning that getting help for my depression doesn't make me weak, it makes me stronger. i just wish it made me better at fishing. [female narrator] mental health care works when you make the call. since 1944, heifer international has been ending hunger and poverty around the world. the basic purpose of heifer project is to provide people with a source of their own food production, so they can provide for themselves without having to feel like they're continually on charity. at heifer international, we believe in what's possible. a family can have food on their table, a child can go to school, and a farmer gets the tools and training they need to succeed. learn more at heifer.org. ♪

this is "cbs news roundup." i'm shanelle kaul in new york. with the democratic national convention wrapping up tonight and just 75 days until election day, donald trump continues his weeklong trek through battleground states and at every stop he insists the last election was rigged. a lot of republican voters believe him, and that's got one gop election clerk in michigan working overtime trying to convince his fellow republicans to trust the process. cbs's adriana diaz has more. >> reporter: late summer on the eastern shore of lake michigan is a slice of serenity, unless you're discussing elections. then forget about smooth sailing. >> we have to beat a corrupt voting system. >> reporter: residents are sounding off at a commission meeting about voting in ottawa county. >> there has just been much distrust sown into the system. >> do you solemnly swear that you will support the constitution of the united

states? >> reporter: a republican who runs elections here is no stranger to the skepticism. do people still think in this area that the 2020 election was stolen? >> we talked to people who do really have serious concerns and who are not really trusting the process. >> reporter: that distrust was on display during local elections two weeks ago. do you have complete trust in elections here? eyebrow raise. >> sure, yeah. >> reporter: even though the officials say that the election was not rigged, that there wasn't widespread fraud? >> it's hard to trust sometimes. >> reporter: these are the people who robuck is trying to convince that the data doesn't lie. >> we conduct post-election audits where we have a 100% accuracy rate on the equipment itself. so that is a really great thing to be able to talk about. >> 100%? >> it's a 100% accuracy rate. >> not 99%? >> it's not even 99%. >> it's hard to do a job where you know you're doing everything right and be attacked. >> reporter: it's a distrust

that helped push former township clerk theresa degraff to retire. >> everybody knows your families and neighbors and they believe folks would try to cheat you. >> reporter: republicans are half as likely as democrats to say they're very confident in the accuracy of the state's election system. that's according to a new cbs news poll that sound 32% of republicans were not confident in their state's voting system as opposed to only 8% of democrats. >> the radical left democrats rigged -- >> rigged the presidential -- >> rigged the presidential election. >> reporter: so far this year, former president trump has said the election system is rigged more than 140 $1.40 times. despite dozens of lawsuits and audits that found the opposite in 2020. >> if we cannot trust the way we run our government, we are in a bad situation as a country. >> reporter: that's why this republican is working on restoring that trust. >> please feel free to come out.

we're here from 9:00 to 10:30 this morning. >> reporter: with demonstrations on how voting machines work. >> we're testing the accuracy of this equipment. >> reporter: and confronting officials who allege fraud. >> it has been proven, ballots are coming in from outside sources that are not from voters. >> we have not seen any evidence at all. >> reporter: with the presidential election just months away, clerks like robuck -- >> we live in this community too. we shop here. kids go to school here. we go to church together, and we need to be able to build those bridges. >> reporter: they're trying to >> reporter: they're trying to rebuild that trust one voter at (granddaughter laughing) when pain freezes you in your tracks... ...vapofreeze your pain away. penetrating pain relief... ...with vicks vapors. (granddaughter laughing) vapofreeze your pain away. now at walmart. (peaceful music) - time to get up, sweetie! (kissing) - [child voiceover] most people might not think much about all the little things you do every day,

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with dove men body wash. overseas now, ukraine unleashed swarms of drones into russia. about a dozen of them targeting moscow. the kremlin claims they were all shot down. meanwhile, vladimir putin continues to downplay the ukrainian offensive into russian territory, calling it a provocation. the ukrainian army now controls about 500 square miles of enemy territory and 120,000 russians have so far fled the fighting. ian lee spoke to one of ukraine's military commanders. his interview was reviewed by the ukrainian army, but had no control over this report. >> reporter: ukrainian forces pored over russia's border 16 days ago. helping to lead the charge was commander vitali, whose identity

we were asked to conceal. what is the mood like that they're finally taking the fight into russia? >> translator: first of all, it gave hope. it raised the morale of the personnel. >> reporter: he says american mine-clearing equipment proved critical in the opening hours of the incursion, but as the battle progressed, ukrainian drones became their greatest asset. the eyes in the sky protecting his troops and directing artillery. another key factor, u.s.-led training of ukrainian forces. has your nato training helped with this kind of operation? >> translator: yes. it opened our eyes in a new way. with this experience, we can conduct similar operations in the future. >> reporter: but he keeps his focus on the here and now. to secure president volodymyr zelenskyy's buffer zone and ease the ukrainians' fighting in the east. while visiting a factory, zelenskyy mentioned the

situation in eastern ukraine is difficult. russian forces are gaining ground, moving in on a strategic city, but the fighting in kursk, the commander says is drawing some of those russian forces away. v vitali argues shows that moscow can be beaten. >> translator: it shows they do not have any advantage. their advantage is just in numbers. >> reporter: he believes ukraine's main advantage is the will to win. ian

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fans of james bond, take note. 17 vehicles from the bond films are now on display at the international spy museum in washington. vladimir duthiers paid a visit. >> bond, james bond. >> bond, james bond. >> reporter: his identity is no secret. 007 has been played by dozens of actors in several film. >> good-bye, mr. bond. >> reporter: it's shaping the quintessential image of globetrotting bond. with his smooth demeanor, dapper style, daring stunts, and fancy gadgets. ♪ >> did you ever read one of the books or see the movies and say, that's exactly how it happens? >> i've read most of the books. >> reporter: johnna mendez, the

founding member of the board was chief of the cia. often dcompared to q in the bon books and films. >> we were magicians at certain points. not actually the performers on stage, but the people behind the magic that built the illusions and the deceptions. >> reporter: but before that, she was a photo operations officer focused on concealing cameras. >> you could take 100 pictures to develop it, your heart would almost stop because you knew the people that had taken the pictures had taken huge risks. >> reporter: she mastered concealing identities later. >> sometimes you would do a couple of dental facades, maybe a wig or a pair of glasses. you would fiddle with a person when they came in. i could have so much fun disguising you. >> areally. >> you are a -- >> a cipher. >> a blank slate. >> reporter: they use face masks

like in "mission: impossible." she wore one of the masks to a meeting with george h.w. bush. he had no idea it was a disguise. >> si said, i'll show you something new, and i'll take it off. he said, don't take it off and he walked over and was looking and he sat back down and he said, okay. take it off. >> wow. correct me if i'm wrong, but when you are recruiting, you're not looking necessarily for the guy who stands out because he's handsome. he's 6'2." i'm evidence of that, right? >> i'm no pierce brosnan. >> reporter: chris acosta is the executive director of the museum, but no real world spy. >> you don't want to be ostentatious unless it's something you want to project. >> you don't want to be remembered. >> exactly. >> reporter: he spent decades in counterintelligence, human intelligence, known as special

operations. how difficult is it when you're in the field to make contact with somebody and to get them to spy for another country? >> you want to build a trusting relationship because that foreign agent is going to take risks for our country, but by the time you get ready to recruit someone, they're waiting. they know what's coming. >> the younger generations seem to think that as it gets harder and harder for us to cross borders to evade the cameras on every street corner, they're assuming that technology will take over and humans will become less important, but it's the basis of the whole thing. ♪ >> reporter: costa showed me one of the bond cars seen in the 2002 film "die another day," now in the museum's collection. >> you can get in. >> reporter: the jaguar xkr was

driven by the villain. you haven't been in any of these vehicles? >> never. this is exciting for me. >> even though this is a bond villain car, i mean, it's still pretty cool. >> i'm trying to get over the fact that i'm a villain, but i'll work with that. >> if you have a car like this, who cares? >> that's right. that's right. >> when these vehicles came to the museum, did you spend a little time with them? >> there are 17 vehicles and there's a very narrow slot that opens up three floors up, but oto see it reassembled in this room is just stunning. >> one of the greatest joys of this job, watching young learners get excited about the museum. i can feed off that. that can sustain this work forever, right? the idea that ople get excited

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