comments@captioncolorado.com >> pelley: the democrats ask, "whom do you trust?" >> it is inconceivable to me that any presidential candidate would be that irresponsible. donald trump cannot be the commander in chief. >> i trust hillary clinton our son's life. >> pelley: also tonight, are south florida mosquitos now spreading zika? federal officials have stopped blood donations there until they find out. airfares drop to lower altitudes. >> we've now seen growth by ultra-low-cost carrier that are really offering rock-bottom fares on those routes. >> pelley: and she could be the first daughter for a second

that was keeping that family together. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. reporting tonight from the democratic national convention in philadelphia. >> pelley: tonight, hillary clinton takes the podium here to accept the daiment nomination for president, in an election that may very well come down to trust. in a cbs news poll taken after last week' convention, 56% of voters said donald trump is not honest and trustworthy, but even more, 67%, said that of clinton. tonight, clinton will try to get her numbers down, or failing that, trump's up. here's nancy cordes. >> reporter: president obama said last night he's ready toes pass the baton. clinton's task tonight is to convince americans they can trust her to carry it. >> so let's talk about trust.

tim kaine, did his part, using the word "trust" nine times. >> as he's serving our nation abroad, i trust hillary clinton with our son's life. ( cheers and applause ) you know who i don't trust? hmmm. i wonder. >> reporter: the virginia senator urged voters not to fall for one of trump's favorite frailzs. >> "believe me, we're going to destroy isis so fast, believe me. there's nothing suspicious in my tax returns. believe me." ( cheers and applause ) folks, you cannot believe one word that comes out of donald trump's mouth. not one word. >> reporter: and yet, the latest cbs news poll found clinton's numbers are worse than

part, of a relentless republican focus on the benghazi attacks -- >> calling it an attack is like saying the sky is blue. of course it was an attack. >> reporter: and her own shifting answers on her use of a private e-mail server. >> there are no classified materials. >> reporter: president obama touched on the problem last night. >> hillary's got her share of critics. she has been character turd by the right, and some on the left. everything you can imagine, and some things that you cannot. but she knows that's what happens when you're under a microscope for 40 years. >> reporter: put trump under a microscope, he said, and you'll find something far worse-- a home-grown demagogue. >> our power doesn't come from some self-declared savior promising he alone can restore order as long as we do things his way.

( cheers and applause ) >> reporter: vice president joe biden said trump lacks empathy. >> he's trying to tell us he cares about the middle class. give me a break. that's a bunch of malarkey. >> reporter: clinton's aides tell me she will not try to be some kind of sunny counter-point to trump's gloomier outlook last week. they say she will acknowledge that the nation has serious systemic problems. the difference, they say, specific solutions to try to deal with those problems in a speech, scott, that was still being tweaked today. >> pelley: nancy cordes, thanks. well, trump's speech at his convention was short on specific solutions. for example, he said that crime will end, but he didn't say how. the theme of the trump campaign today was damage control, and here's major garrett. >> reporter: donald trump spent the day embroiled in a controversy of his own making.

yesterday. >> russia, if you're listening, i hope you're able to find the 30,000 e-mailses that are missing. >> reporter: those e-mails aren't exactly missing. they were deleted from the private e-mail server hillary clinton used while secretary of state. trump's call for russian interference comes after a second e-mail scandal. hackers penetrated the servers of the d.n.c., leading to the release of 19,000 e-mails. u.s. officials suspect russia is behind it. were a joke. >> of course, i'm being sarcastic, and they don't even know, frankly, if it's russia. they have no idea if it's russia, if it's china, if it's somebody else. who knows who it is? >> reporter: rudy giuliani is a top trump surrogate and former presidential candidate. >> donald trump made a mistake and he corrected it. >> reporter: and that's part of his evolution as a nominee. >> part ofs his evolution as a nominee and part of the process of being so transparent and so

drew a harsh rebuke at last night's democratic convention. leon panetta accused trump of inciting foreign eps nawnl. >> as someone who was responsible for protecting our nation from cyber attacks, it is inconceivable to me that any presidential candidate would be that irresponsible. >> reporter: meanwhile, trump tried to suppress viewership tonight when hillary clinton speaks. in a funds raising e-mail he warned supporters would be, "lied t attacked" for their beliefs." trump may have noticed tv ratings for the democrats are beating his g.o.p. convention, defying his prediction last friday. >> nobody's going to watch this next convention. >> reporter: trump said today this convention describes an america that does not exist, one of full employment, border security, and success against isis. for context, scott, trump also said putin is a better leader than president obama, fighting words to be sure on this

us. major, thank you. well, for many young americans, this is their first election, and we wondered what they're thinking. so demarco morgan talked to three pennsylvania college students, erin duffy, breeon buchanan, and tyra woods, all of them undecided. >> it's a tough situation because we're new voters, so we want to make the right decision for our future. >> it's kind of like we don't know who to vote for. like, i know a lot of my friends feel the same candidate. >> this is my first time voting so what we've seen so far has been kind of like a spectacle. but we don't really know who toes choose. >> reporter: and what are you looking for? >> i'm looking for somebody who is actually going to make a change in our country, and even if it's the smallest thing. >> reporter: what about the conventions? i'm sure you guys paid attention to the republican convention in cleveland. >> our convention occurs at a moment of crisis for our nation-- the attacks on our

cities threaten our very way of life. >> i think he was the only one that actuallycracied that we are in a crisis. i think that was very brave of him. in a sense. i don't think he's handling it the right way. he's just being his aggressive self. >> and i don't want to be afraid because that's how i feel whenever i feel like donald trump is speaking, afraid of if he were to get in office what would it be like? what would the next four years you that this country isn't great, that somehow we need to make it great again because this right now is the greatest country on earth. ( cheers and applause ). >> they saw what was happening and today in the news and everything, even with this election, like, it's a representation of-- is america really great? >> we were the melting pot at one point. i think that we need to go back

different cultures and different ways of life. it's like we take 10 steps forward and two steps back. so where is the change going to come in? >> what are we doing to actually fix it? what are they going to do by november that will moat mate millennials to vote, to get them ready and excited? what's going to push us? because right now, there's a lot of indifference. >> if you don't vote, don't complain when you don't like something that's happening because you didn't vote. >> reporter: scott, that recent cbs news after the g.o.p. convention found seven pfers voters nationwide are still undecided. >> pelley: demarco morgan speaking to we, the people. demarco, thanks. well, american women didn't win the right to vote until 1920. by then, freed slaves had been voting for 50 years. what does tonight mean to hillary clinton? we asked her in her only interview with running mate tim

what will be accomplished if you are elected the first woman president to the united states? >> i think it would be a great moment for our country because every little boy and every little girl should be given the chance to go as far as his or her hard work and talent might take them. i see it in the eyes of little girls who come to my events. they were so excited, and they're so proud they just discovered we haven't had any girl presidents. a lot of them go to restaurants where there are placemats and all of the presidents are men. and then they start asking questions. i just think it will be another-- another step on our journey as a nation, making it clear that this country is open to everyone.

despair, and to accept that nomination, i'll be thinking about all the women who came before, the suffragettes, the women who knocked their heads against all kind of barriers and broke through, and everything from, you know, space to politics. and i hope that it gives other women and girls the feeling that whatever their dreams might be, they can achieve them in this coverage of hillary clinton's acceptance speech begins at 10:00 eastern, 9:00 central. we'll be joined right here by norah o'donnell, charlie rose, gayle king, john dickerson, and bob schieffer. in another important story tonight, there is now growing evidence that mosquitos in south florida are spreading the zika virus, so today the food and drug administration asked blood banks in two counties to stop

we have more now from david begnaud. >> the federal request to stop all blood donations is meant to safeguard the blood supply until blood banks are equipped to test every donation for zika. there is increasing concern tonight that four new zika cases could be the first transmitted by local mosquitos in the continental u.s. two cases are in miami-dade county. the two others are in broward county. officials do not believe they are travel related. onue began visiting residents in the neighborhoods where the four new zika patients live and work. they are collecting urine samples to test for any new cases. dr. aileen marty, an infectious disease doctor with florida international university, was one of those door knock. >> most people were understanding, but a few were a little bit-- you know, it's unusual to have someone knocking on your door with a cooler full of urine samples. >> reporter: local mosquito-control workers are

to eradicate mosquitoes and their breeding grounds. >> release the mosquitos, josh. >> oh, my god, they're coming. >> reporter: within five seconds one mosquito was trying to get to your arm. what does this show? >> this shows the power of mosquitos' sense of smell and how they're so atuned to human odor. >> reporter: dr. matthew degennaro studies mosquito behavior and geneticking at f.i.u. how does deet actually work? >> mosos but even the few that still can find you, if they land on you, they'll taste it on your skin, and they'll be like yuck. and they won't bite you and they'll go away. >> reporter: there is no vaccine, and there's no treatment for zika. tonight, people in south florida are being told use that deet repellent. it's the most effective tool yet. scott, starting tomorrow, the largest blood bank in the southeastern u.s. will test

this closely. david, thank you very much. coming up next on the cbs evening news from philadelphia, why airlines are dropping fares. and later, a major development in the murder of washington

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airlines, especially ultralow-fare carriers, spirit, frontier, and allegiant, have grown aggressively, expanding capacity, just as terror attacks in europe, economic uncertainty in britain, a strong dollar, and increased competition are cutting into lucrative routes for united, american, delta, and southwest. >> i think you'll see airlines have lower profits than they would have expected for the back half of the year and for 2017. >> reporter: josh marks is an airline consultant. >> a lot of competition on routes, particularly leisure markets where they had a significant market share before. we've now seen growth by ultralow-cost carriers that are really offering rock-bottom fares. >> reporter: on average, vacation sphraers dropped 17% since last july. l.a. to paris round trip went for as much as $1500. now it can be had for less than $400. new york to hong kong was $9how.

george hobica runs airfarewatchdog, a web site tracking prices. >> i think for domestic travel, these are some of the best airfares we've seen in five years. for international travel on some routes, the best airfares we've ever seen. >> reporter: the airline business is notoriously boom or bust. last year, it was record profits. scott, now, the airlines are lowering their expectations for the rest of this year but profitable. >> pelley: kris van cleave, thanks. still ahead, a mystery in the sky, a mystery no more. ahhh the sweet taste of victory! prilosec otc. one pill each morning.

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>> pelley: hillary clinton will be introduced here tonight by her daughter, chelsea. the little girl so much us remember from her white house years is all grown up, and here's vinita nair. >> now, this is the most

uses her mother's smart. >> this is another area where the supreme court really matters. >> reporter: and her father's flare. >> sure! >> thank you so much. >> reporter: at 36, chelsea clinton is one of the campaign's most valuable assets. after all, she's been on the trail with her parent since she was two. in 1991, when bill clinton launched his presidential campaign, a then-11-year-old chelsea could barely be seen. it would stay that way for most of her eight years in the white ho shield her from the press's lens, they were less successful against comedic tongs. her looks were spoofed on "saturday night live." attending stanford university in california brought chelsea temporary reprieve from the lime light until her sophmore year, during the height of the monica lewinsky scandal. >> chelsea really was the only thing that was keeping that family together at that point. >> reporter: lloyd grove, editor at large at the "the

ago. >> the clintons took their queue from their friend jacqueline kennedy, who actually sat down with hillary and told her-- you know, gave her, her insight into how she raised carol and i know john in the white house. >> reporter: since then, chelsea has come into her own. she's taken a more public role at the clinton global initiative. >> i always learn something every time listen to my parent. >> reporter: and tonight the mother of two will proudly introduce her mother at the convention. what do you tonight? >> it's chelsea's job tonight to show the human side of her mother. ? woke up, it was a chelsea morning ? >> reporter: the girl named after a joni mitchell song, "chelsea morning," will finally have her night ? and a rainbow on the wall ? >> reporter: vinita nair, cbs news, new york. >> pelley: and that's the cbs evening news from philadelphia. cbs news coverage will hillary clinton's acceptance speech begins at 10:00, 9:00 central.

"the insider" tracking the biggest stories making news today. number one -- hollywood continues the dnc takeover. as a former "glee" star takes us inside broadway's newest tribute. ? what darren criss here, i just goff got offstage after singing. >> and stephen colbert joins hillary's "fight song." and julia roberts speaks out for the first time about losing her friend, garry marshall. >> he's such an amazing human being. >> their 30-year friendship. and number three, kristen stewart gets candid about her lady love.