A second and third tier are hoping to break through but still in single digits. Bidens lead is shrinking mostly because of harris and warren. Who are also ahead of sanders for distinct reasons. After months of rolling out detailed policy plans after months of rolling out detailed policy plans a majority of democrats feel warren will fight a great deal for them and after a standout debate last month, harris is seen as one of the strongest in the field and one of the main reasons people are considering voting for her. Odonnell and ed, what did we find out about the issues . That democrats care most about. Reporter healthcare, healthcare, healthcare, and voters are less concerned with how theyre covered and more concerned about the cost. Thats notable because these days candidates seem to be focused more on how americans get the coverage, not the out of pocket costs. Well see how it changes in weeks. Odonnell ed okeefe, thank you. Were going to stay on the topic of healthcare because a new study finds Colorectal Cancer rates are rising among americans under 50 years old. Colon cancer is the second deadliest cancer behind lung cancer and when diagnosed in younger patients, its more likely to be in advanced stages. Our medical correspondent dr. Jon lapook is here. Jon, how concerned are you about this . Im quite concerned. Weve been looking at this apparent trend for years wondering if it is real, turns out this trend is real and especially worrisome because it turns out, in people under 50, colon cancer is more deadly. Odonnell overall colon cancer rates are declining for those over 50, right . Why the increase in younger adults . Right well over 50 declined because of the successful colonoscopy. Under 50, it has something to do with the gut microbiome, the trillions of species of bacteria in our gut linked to colon cancer. Maybe were messing up our gut micro biome with our diet. The antibiotics and modern diet. Odonnell so what are the guidelines about when you should be screened . People at average risk at age 50. If you have increased risk, younger than that. The current recommendation do say this for most of the societies but turns out the American Cancer Society is saying, in view of the recent findings, lets look at age 45 as a time to start the discussion. I think that leaves people wondering what to do and i think this is a time for informed and shared decisionmaking meaning you sit down with your clinician and say what are the risks and benefits and go from there. Odonnell disturbing to hear about more younger people getting colon cancer. It is. Glor odonnell thank you so glad youre here. And relieve is on the way from the staggering heat that gripped the u. S. Over the weekend and pushed out by potentially severe storms, watches and warnings posted from tennessee to rhode island with the greatest threat along the atlantic coast. The heat wave is blamed for nine deaths, more than 300,000 homes homes and businesses are still without power in michigan wisconsin, maryland, and new york city. Still ahead the possible break in the murders of an American Woman and her boyfriend in a remote part of canada. Allegations of Sexual Assault and misconduct at an all male college, one posted his story on social media. And new Research Shows how to lose up to 16 pounds, a lot easier than you think. Starting a business means i have to be well rested, every night of the month. Always overnight pads have up to a 2x larger back for up to 10 hours of protection. It catches leaks, so you can catch zzzzs. Because my morning starts, before morning starts. Always. I switched to geico and saved hundreds. Thats a win. But its not the only reason i switched. Geicos a company i can trust, with over 75 years of great savings and service. Now thats a winwin. Switch to geico. Its a winwin. Switch to geico. 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In his post keys accused demarcus crews, an assistant dean and Student Housing director of unwanted touching and pinching and sexual comments. He always targets freshmen, and i see it every day. It just sickens me. Reporter youre describing something that sounds almost predatory. It is very predatory, yes. Reporter keys says morehouse never followed up when he complained in january, 2018. Do you have any satisfaction at all from the way morehouse has treated you . I have no satisfaction. Reporter another morehouse student retweeted keys allegations with his own complaints. I, too, was sexually harassed by demarcus crews. Reporter morehouse put crews on unpaid administrative leave and says its investigating. Key complained through the department of educations title ix office, it has 372 ongoing investigations into Sexual Harassment and violence on College Campuses nationwide. One case involved robert peterson, a former morehouse sociology professor, a student complained he gave the student alcohol and groped him on a school trip to brazil in 2015. H remain anonymous. They were aware of me getting reporter late this afternoon, professor peterson responded to our email and denied the allegations, saying none of this happened. Demarcus crews never responded. Morehouse college said it will take the necessary action to protect the safety of its students. Finally, norah, michael keys has left morehouse and is looking for a new school. Odonnell all right, mark strassmann, thank you. Still ahead, another fan is hit by a line drive. What one team is doing to protect the crowd. And the sight that brought tears to the eyes of a firefighter. Swim meets every saturday. But now. Its thursday. Good thing they discovered gain flings, with oxi boost and febreze odor remover. Gain flings. Seriously good scent odonnell police in western canada have a person of interest in the murders of an American Woman and her australian boyfriend. The couple were shot to death last week after their van broke down on a remote highway known by some as the highway of tears. Today Police Released a sketch of a man seen talking with them the night before their bodies were found. Tonight a first for keeping baseball fans safe. The Chicago White sox extended protective netting to both foul poles in the outfield corners. They are the first Big League Team to do that. A number of fans have been hurt recently by foul balls. In cleveland yesterday a line drive sent a 3yearold boy to the hospital. The netting there stops at the ends of the dugouts. New Research Shows it doesnt take much to lose a lot. People just slightly over weight were able to lose 16 pounds over two years just by cutting 300 calories a day from their diets. They also improved their cholesterol and blood sugar levels. 300 calories is the equivalent of two cookies or a cup of ice odonnell we wanted to end tonight with a sight that brought a brave young firefighter to tears. For the first time in his life, he saw the American Flag in all its starspangled glory. Its the most treasured symbol of our country. Imagine if you couldnt see the red, white and blue. Thats exactly what happened to douglas county, georgia firefighter Spencer Caradine. I never knew that there was a different red than my eyes. Odonnell spencer is color blind and only reently found out, all because of his fellow firefighter jordan gardner. When i realized he couldnt see what i saw, i wanted to fix it. Odonnell jordan ordered him a pair of special glasses and planned a big surprise on the fourth of july. So we all pitched in and got these. You have to close your eyes, though. You have to come out here. Odonnell overcome with emotion, spencer looks at the stars and stripes first, and then looks at everything else. Thank you. Odonnell this is what it looked like before his glasses. And now, in all its glory that look on his face, it was the best feeling in the world. Odonnell and Spencer Caradine told us that, while he sees old glory in a new way, it has not changed what those stars and stripes stand for. And thats the overnight news for this tuesday. For some of you the news continues for others check back late erfor morning news and cbs this morning. From the Broadcast Center in new york city im norah odonnell. This is the cbs overnight news. Welcome to the overnight news im nikki baptiste. The people in puerto rico are up in arms involving the governor and top aides. Tens of thousands took to the streets of san juan and david was there. Reporter the president made a surprise saying the reason hes not resigned he respected rule and order and democracy. Ive got to tell you, from interviewing hundreds of people who are out here tonight, they are asking him to respect the fact that they changed their mind and thats why they want him out. The protesters shut down a main highway that connects san juan to the rest of the island. It appeared to be the largest demonstration yet and the message was very clear, they wont stop until the governor steps down. Our schools are really poor right now. Im a teacher. I dont have a job right now because theyre closing schools. Reporter what is it like for a 14yearold to witness what is going on . Its really amazing. Its just astonishing to really see basically the whole puerto rico coming together as a whole. Reporter heres how they got here. Puerto ricans already reeling from Hurricane Maria and a debt crisis learned that the f. B. I. Arrested the former heads of the education and Health Insurance departments for allegedly funneling money to friends. The final straw was a trove of leaked chat messages between the governor and top aides. In one exchange, the governors former chief Financial Officer says, dont we have a cadaver to feed the crows . That was in the aftermath of the hurricane. I apologize for it. Reporter today the governor speaking on fox news faced one question he struggled to answer all week. Who specifically is supporting you today . Reporter he named the local mayor of san sebastian. That mayor told cbs news he does not support the governor, nor does President Trump, who said this today. Look, hes a terrible governor. The congress of the United States handed him 92 billion, and that 92 billion is in the hands of incompetent people and very corrupt people. Reporter heres the truth puerto rico has received 14 billion since Hurricane Maria nearly two years ago. Every time the governor goes on television and speaks its like pouring fuel on an open flame. President trump continues his war of words with four Democratic Congress wembley he women he told to go back where he cams from. I really think they must hate our country. Reporter the president is still on the attack now calling these four congresswomen racist. In a tweet today he said the squad is a very racist group of troublemakers who are young, inexperienced and not very smart. Mr. President , why is the squad racist . He didnt respond but elevated the profiles of these freshmen congresswomen after tweeting last week that they should go back to the countries they came from. Yeah, im not going anywhere until i impeach this president. Reporter michigan representative Rashida Tlaib is part of the squad and spoke at the n. A. A. C. P. Convention in detroit today. Its beyond just the four of us. You are all the squad. Reporter the cbs news poll shows 82 of republicans agree with President Trumps goback tweets while 88 of democrats disagree. chanting send her back reporter supporters of the president s rally in North Carolina last week chanted send her back in reference to minnesota congresswoman ilhan omar, an immigrant from somalia. The president did nothing to stop it, he later said he was unhappy about it but called the crowd incredible patriots. You have a chance to say it right now. Dont do it again. Chief washington correspondent pressed Major Garrett pressed Vice President mike pence on whether team trump would stop future racist chants. Major, the president was clear. Reporter was he . That he wasnt happy about it and if it happened again he might hed make an effort to speak out about it. Reporter today in the oval office, the president was asked if hes concerned about inflaming racial tensions and the president claimed there are no racial tensions. Tensions remain high in the persian gulf with iran is holding a British Oil Tanker and has arrested 17 people spying for the cia. Reporter tehran released this video claiming it was clear evidence of a c. I. A. Spy ring involving 17 iranian nationals and their american handlers, but they offered few other details, and some of the accused, it says, will face execution. Speaking at the white house, President Trump had this to say i read a report today about c. I. A. Thats totally a false story. Thats another lie. They put out propaganda and lies. Reporter the allegations follow irans revolutionary guards storming a british flagged oil tanker over the weekend. Radio recordings capture the moment the ship was apparently forced into iranian territorial waters by commandos despite warnings from a nearby british warship. If you obey you will be safe. Alter your course to 360 degrees immediately. Over. Navy patrol boat this is british please confirm that you are not intending to violate International LawPresident Trump said hes still open to talks with the iranian leaders but as things continue to escalate, he says its getting harder for him to want to make a deal with them. Eight months after President Trump said hed be pulling all of u. S. Troops out of syria more than a thousand remain. David took a trip to the war zone and filed this report. Thi outpost in southeastern syria used to belong to i. S. I. S. , but now its in the hands of American Special forces riding out to pick us up like a scene from mad max. Cbs news came to this place with general frank mckenzie, commander of the u. S. Forces in the middle east. Were standing on the damascusbaghdad highway just inside syria, and were supporting our partners in the fight against i. S. I. S. Reporter from this compound still choked with rubble from the battles, special forces travel to even more remote outposts to train local tribes to hunt down the remainder of i. S. I. S. They try to get in the desert and our partners help go out and get them. Reporter its been four months since the last piece of i. S. I. S. Held territory was liberated and there are still nearly 1,000 u. S. Troops in syria. The main american base is in northern syria, where a strip long enough to handle jet transports has been carved out of the syrian plain. Its industrial Strength Logistics like only the American Military can do and theres no end in sight. There are still ripe targets out there and were going after them. Reporter nothing here is easy. Fall rains turned this dust into ankledeep mud. The b22 ospreys that flew us out of syria had to refuel in the air in order to make it. I. S. I. S. May be on the run in syria but is still alive and angels. A u. S. 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