Hyperventilating. Today, Hillary Clinton explained why she used private email to conduct official business as secretary of state. She said it was a matter of convenience, but routing the communications through her server at home prevented some of those emails from being archived at the state department and allowed her to decide later which records to make public and which to delete. Nancy cordes put the question to the former secretary and future candidate. Reporter clinton emerged from a speech at the u. N. To face a crowd of hundreds of journalists. She issued this mea culpa. Su looking back, it would have been better for me to use two separate phones and two emailac accounts. I thought using one device would be simpler, and, obviously, it hasnt worked out that way. Reporter clinton claimed that the private server sheit shared with her husband at their home in new york was secure and was never hacked, and that she never emailed classified material. First, the laws and regulations in effect when i was secretary of state allowed me to use my email for work. That is undisputed. Reporter federal regulations from 2009 require that federal records sent or received on private email accounts must be preserved in the appropriate Agency Recordkeeping system, but clinton didnt turn over her e mails until this past december nearly two years after she left the administration, and only after the state department asked for them. In going through the emails, there were over 60,000 in total sent and received. About half were work related and went to the state department. Reporter the rest, she says, were personal, so she deleted them permanently. Emails about planning chelseas wedding, or my mothers funeral arrangements, a condolence notes to friends, as well as yoga routines, family vacations, the other things you typically find in inboxes. Reporter how could the public be assured when you deleted emails that were t personal in nature that you e didnt also delete emails that were professional but possibly unflattering . Ou well, first of all, you would have to ask that question to every single federal employee because the way the system works, the federal employee, the individual, whether they have one device, two devices, three devices, how many addresses, they make the decision. Reporter republicans investigating the 2012 benghazi attacks were not satisfied with that and said clinton shouldrv turn over her server to an independent thirdparty neutral observer. But, scott, clinton said her private server will remain just that, private. Pelley nancy, thank you. Now lets bring in john dickerson. John, the partisans are going to believe what they want to believe. There is no chance any mindshe were changed there today so what difference does any of this make in Hillary Clintons campaign for the democratic president ial nomination . Hi reporter i think part of that answer will come from whether were still talking about this closer to election time. And that depends on when and how the issue comes up again, either when the state departmenthe releases the emails or congressional investigators do. The central question here is trust. Hillary clinton today asked voters if they to trust her, and the question is do they . The question applies not just to the way she handled these e mails but do they trust her in general when they see her explain her action. These kinds of situations give candidacies a chance to forge new connections with voters or a candidate can raise new doubts in the moment theyre trying to explain themselves. Some voters may make those judgments now, but between now and election day we can be sure there will be other moments where the same instincts clinton t displayed today will be tested again, scott. Pelley john thanks very much. In another big story today, the university of oklahoma has expelled two students involved in that racist video we told you about yesterday. H now, another video has surfaced. Jericka duncan is in norman, oklahoma. Reporter the students expelled today are accused of playing a leadership role in the racist video that has since tarnished the university. I did want to help out. Reporter senior laurena hartnett is a Sorority Member and knows many of the now suspended Sigma Alpha Epsilon members. Its very embarrassing for our campus, and it just i just wish that this was a bad dream that we could just all wake up from. Reporter cbs news has learned that nightmare started saturday night on a bus ride to an event celebrating the 159th anniversary of the fraternity. This is my bedroom. Reporter 15year s. A. E house mother Beauton Gilbow expressed shock when we interviewed her last night. I heard the words. Unbelievable. This is not this is not s. A. E. Reporter but by this morning, this 2013 video surface of her singing lyrics to a rap song using the same offensive language she had earlierne condemned. In a statement today, she said i am heartbroken by the portrayal that i am in some way racist. I have friends of all race and do not tolerate any form of discrimination in my life. I hate that she did that, and i know that a lot of people probably will look at thats differently because she was supposedly singing lyrics to a song, but its never okay. Reporter will james ii visited his old Fraternity House for the First Time Since both videos were leaked. He was one of the first black members of the o. U. Chapter when he joined in 2001. This was our home, and i dont think its ever coming back, and so that is tragic. Reporter the s. A. E. Investigation is widening tonight. Scott, Leaders Within the organization say several other incidents have been brought to their attention. Pelley Jericka Duncan reporting for us from oklahoma. Today, for the first time, we saw what is essentially the confession that dzhokar tsarnaevwr wrote in what he must have thought were the last moments of his life. Photos were shown at the Boston Marathon bombing trial. The note is scrawled inside the hull of a boat where tsarnaev was hiding. The words interrupted by his blood and the holes from a hail of police bullets. Prosecutors say the bombing was revenge for the deaths of muslims overseas. Tsarnaev wrote, the u. S. Government is killing ource innocent civilians. S i cant stand to see such evild. Go unpunished. Ed, if convicted, tsarnaevs punishment could be death. There was more fallout today from that open letter in which Senate Republicans attempted toy scuttle any nuclear deal between president obama and iran. With more on that, heres our chief White House Correspondent major garrett. Reporter Vice President joe biden said he was offended by the letter. Biden, who served more than 30 years in the senate, said it was beneath the dignity of an institution i revere. He accused Senate Republicans of trying to undercut our president and circumvent our constitutional system. The letter, authored by freshman republican tom cotton of arkansas and signed by 46 other republican senators warned iranian leaders if congress does not ratify any nuclear deal, the next president or future congresses could revoke or modify it. Democrats said republicans were siding with hard liners in iran. Democrat Dianne Feinstein its shocking. Ee ive been here for 22 years. I have never seen anybody do this. Reporter cotton, 37, is the youngest member of the senate. He served with the army in iraq and afghanistan and denied it undermining the Ongoing Nuclear negotiations. The Congress Must approve a deal for a deal to be lasting and congress will only approve a deal if it stops iran from getting a nuclear weapon. Reporter cottons republican colleague, Lindsey Graham of south carolina, called the president dangerously naive. The president of the United States seems to embrace a construct that there are moderates to negotiate with iran running the government. That is beyond delusional. Thats dangerous. Reporter president obama has threatened to veto any congressional legislation that would require congress to approve what would be a Multinational Nuclear Deal with iran, but, scott, all sides agree, only congress can lift the economic sanctions that drove tehran to the negotiating table in the first place. Pelley major, thanks very much. Overseas, Iraqi Forces Say they are making progress in the week old battle for tikrit, a city of a quarter million controlled by isis. U. S. Troops are not directly involved. Yesterday, the chairman of the joint chiefs of staff, general martin dempsey, questioned whether the coalition against isis is in it for the long haul. Tonight, Holly Williams has the iraqi response. Reporter after a week of fighting, iraqi forces claim theyre closing in on tikrit. Today, they seized the town of alam, just five miles from the city. Now we are surrounding tikrit from four directions. Reporter general saad maan of iraqs interior ministry dismissed criticism from americas top general, martin dempsey, of Iraqi Forces Lack of readiness. We are not kids in our work. We have skills. Ry we have a very big amount of experience. Reporter but in tikrit progress is painfully slow as isis fights back with weapons including mines and suicide bombs. This internet video appears to show an iraqi soldier sobbing for his fallen comrades after an isis truck bomb killed several of them. In the bloody battle for tikrit, the Iraqi Government denied that troops from neighboring iran are fighting alongside its soldiers and says iranian officers are serving only as advisors. If there is a disaster in iraq, of course, it will affect iran. Reporter but if they retake tikrit, it may be a perfect crucible for iraqs deadly religious tensions to explode. The iranians are shiite muslims, as are most of the iraqi forces, yet tikrit is a mainly sunni muslim city. There is no problem. We all of us are iraqi. There is no problem. Believe me, there is no problem. Ite reporter but shiite muslimed militias are already accused of massacring more than 70 unarmed sunni men after defeating isis in diyala province. The Iraqi Government says its investigating what happened. Pelley Holly Williams covering the war on isis for us from baghdad tonight. Holly, thank you. Also today, isis released a video purporting to show a child soldier executing a bound hostage. Unlike other isis videos, the boy there on the left and an adult militant were not wearing masks. There is no telling what isis was trying to communicate to the world by inciting a child to murder. A group of iraqis who worked alongside american troops are now suing the u. S. Governmenten because they say they cant get visas to immigrate to america. They claim that their lives depend on them. Anna werner has one mans story. Its like anything else, if somebody has your back you get their back. Reporter captain doug vossen did two tours in iraq as an army officer and says the translator who worked by his side was also his protector and adviser. It sounds like he was literally guiding you to safety. Yup. Im 24 years old with one year of military training at fort benning. What the hell am i supposed toel do in baghdad . I would have been dead. Reporter for many iraqis working for the u. S. Military could be a death sentence, so most had to hide their identities and use fake names. Vossens translator was nicknamed frodo. I remember hearing it for the first time. Im like really, seriously . Frodo yeah, man, and thats subzero. Reporter but vossen says the threat from renewed violence in iraq has frodo afraid for his life. He has received Death Threats and is now in hiding with his wife and three daughters. In 2008, congress recognized the danger to iraqi translators and created a special fasttrack immigrant visa program to bring them to the u. S. Applications were supposed to be turned around in less than nine months but frodo has now been waiting over three years and hes not alone. I have been waiting in iraq for over 30 months. Reporter Katherine Reisner is with the iraqi refugee assistance project. We see wait times of up toro five and a half years. Reporter youve seen them far exceeding what congress saidgr they really should be doing. Absolutely. Reporter more than 6,000 visas have been issued since 2008, but reisner says 1,800 iraqis are still in limbo. The state department would not comment on the lawsuit. If the state department were to say to you, look, were doing the very best that we can, what would you say . I would say thats not an acceptable answer. Reporter vossen says he thinks about his friend everyy day. He was there risking his life when the United States government came calling, and now, when he is at the end of his rope, completely desperate for him and his family, were not returning the favor. Just not right. Reporter reisner says after years of being given no information from the state department, other than the applications are in administrative processing, she hopes, scott, that this lawsuit will finally get some answers for the translators whose lives they say are at risk here. Pelley anna, thank you very much. Firefighters race to save a mother and her daughters. And a group of hit makers will have to give it up to marvin gaye when the cbs evening newsws continues. Ues. [ hoof beats ] i wish. 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Pelley songwriters will tell you theres a fine line between paying tribute to another artist and ripping him off. A jury in california says the hit makers who wrote blurred lines have crossed that line, and now theyve got to give it up to the family of the latemi marvin gaye. Heres John Blackstone. Reporter the jury had to decide whether the biggest hit of 2013, blurred lines by robin thicke and Pharrell Williams, was a copy of the 1977 marvin gaye hit got to give it up. The jury ruled the songs were so similar, that blurred lines was a copy of marvin gayes work. Gayes daughter, nona. There was nothing else to do but stand up for him, stand up for his music, stand up when someone is going to try to pilfer and take something away. Reporter in court, williams testified he was channeling that late 70s feeling when he wrote blurred lines, but said gotta give it up did not consciously influence him. Howard king is williams attorney. The song blurred lines came from the heart and soul of Pharrell Williams, and no one else. Reporter richard bush is the t gaye familys attorney. And throughout this case they made comments about how this was about a groove and about how this was an era and how about this was about a genre. It wasnt. It was about the copying of got to give it up. Reporter the jury awarded marvin gayes family 7. 4 million for the copyright infringement. Scott, Pharrell Williams and robin thicke have each made about 5 million from blurred lines. Pelley John Blackstone in our San Francisco newsroom john, thanks very much. Two teens foil a child abduction when we come back. You owned your car for four years. You named it brad. You loved brad. And then you totaled him. You two had been through everything together. Two boyfriends. Three jobs. Youre like nothing can replace brad then Liberty Mutual calls. And you break into your happy dance. 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Because it gives me. Zero heartburn prilosec otc. The number 1 doctorrecommended frequent heartburn medicine for 9 straight years. One pill each morning. 24 hours. Zero heartburn. Sunday dinners at my house. Its a full day for me, and i love it. But when i started having back pain my sister had to come help. I dont like asking for help. I took tylenol but i had to take six pills to get through the day. So my daughter brought over some aleve. Its just two pills, all day and now, im back aleve. Two pills. All day strong, all day long. And now introducing aleve pm for a better am. Pelley the selloff on wall street continues. The dow lost another 332 points today, wiping out its gains for the year so far. Wall streets worried that theat t fed will raise Interest Rates because the economy is improving. Just today, the Labor Department reported there are about 5de million job openings, and thats the most in 14 years. Two teenagers are being called heroes for chasing a man who tried to kidnap a toddler from a park in sprague, washington. Part of the chase was caught on video. The teens had heard a girl screaming that a man was trying to abduct her twoyearold brother. The suspects got scared and ran off without the boy. The police are trying to track him down. In south los angelesth firefighters rescued a woman and her two young daughters last night. Flames were shooting from the apartment. Firefighters raised a ladder to a window and helped the mother and children escape. Ig investigators will only say the cause was an accident. Our final story tonight is straight out of hollywood, and its coming up next. Know how uncomfortable it can be. But did you know that the lack of saliva can also lead to tooth decay and bad breath . Well, there is biotene specially formulated with moisturizers and lubricants. Biotene can provide soothing relief and it helps keep your mouth healthy too. 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Its a natural source of fiber and five essential vitamins. Try Sunsweet Amazin prune juice. Also available in light. Pelley we end tonight with one of the most famous signs in the world, nine letters long and they all spell trouble for the folks who live nearby. Heres ben tracy. Reporter if you come to hollywood, you better be ready for your closeup. And if you hike just far enough there it is, right there. The Hollywood Sign. Reporter you get this viewhi and likely a visit with this guy. My name is tom lebonge. Im a counselor with the city of los angeles in hollywood california. Reporter lebonge is an avid hiker and the unofficial ambassador of l. A. s nineletter landmark. God bless paris. Thank you for the greatest gift gif of the statue of liberty. How long are you here for . Two weeks. I do love tourists and i do love the people of los angeles im trying to solve this situation. Reporter the situation is this cars, people, cars, people. All trying to reach the Hollywood Sign through a neighborhood home to 20,000 other people. This was once a littleknown access point to l. A. s griffith park. G. P. S. And the internet have now given everyone a map to sara jane schwartzs front door. Shes lived here for 35 years. Its like inviting people to a public pool where theres no lifeguard. Reporter shes documented the mayhem, narrow streets lined with tour buses and cars, and hordes of people walking in between them. Some weekends, 10,000 people walk past her house. Is your concern really safety or is it just flat out annoying having all these people in cars in your neighborhood . Believe me, i wouldnt be doing that if it was just an inconvenience. Until they can figure out how to make this place safe, this should all be shut down. Reporter the city has restricted parking. Theres a guard to keep an eye on things. And big signs trying to throw sign seekers off the trail, but this hike is in a public park, and the city says it should stay open. Im for the public. Well, but the public, if they get run over in the street thats not being for the public. Reporter ironically, the sign was put up in 1923 to attract the public. Homeowners for a new neighborhood called hollywoodland. Have you gone up to the sign yet . Reporter but its the shorter version, worthy of a selfie, thats now causing so much strife. Tick on the bucket list, i guess. Reporter ben tracy, cbs news, hollywood. T pelley hooray for hollywood. Thats the cbs evening news for tonight. For all of us at cbs news, all around the world, good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org your realtime captioner is linda marie macdonald. Now at 6 00, big plans to blow up part of the old bay bridge may go poof because of a small fish and this time even the environmentalists are scratching their heads. Good evening, im ken bastida. Im veronica de la cruz. The latest bump in the way of the old bay bridge its small enough to hold in your hand. Allen martin says that means a bigger price tag. Allen. Reporter veronica, the plan was to save money and protect the environment at the same time by bringing down the old bridge piers using explosives but caltrans is taking a detour for a fish. The long thin smelt are on the countdown to extinction. Reporter meet the palm size fish in trouble. Combined with the delta smelt and salmon really demonstrate that is a systemwide collapse not some frail species that cant hack it in a changing world. Right now im asking can i do this once . Reporter just three weeks ago caltrans announced that it wants to remove the old bay bridge piers with a series of small explosions beneath the bay a sort of mini implosion they describe as more bay friendly. So we can really minimize the impact to wildlife. Reporter and less expensive. And were done in about 6 seconds. Reporter but now, the California Department of fish and wildlife wants to make sure that costeffective implosion strategy wont cost the lives of too many smelts and this isnt the first time the demolition has run into wildlife concerns. At this point in terms of deterrents and monitoring, we spent 3. 3 million. Reporter protecting birds on the ol