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9-day space shuttle mission. the mission was to learn more about the aging process in space. the flight proved once again glenn was a man who embraced a challenge. in 2012, president obama recognized that and all of his accomplishments by awarding the former astronaut and senator the nation's highest civilian honor. the presidential medal of freedom. for most people, fame is fleeting. for john herschel glenn, he'd lasted a lifetime. diabetes can be a daily struggle,

In world war ii and the korean war before becoming a test pilot. after leaving nasa he spent the next decade as a businessman but in 1974 he ran for and won a u.s. senate seat from ohio. when he announced he'd retire at the end of the 105 congress, glenn had served for 24 years. he was regarded as an effective legislator and moderate democrat. not everything went perfectly for glenn, however. in 1984 he ran for president. >> with the nomination of my party, i firmly believe i can beat ronald reagan. >> reporter: john glenn never gave up on his dream of one day returning to space. he got to be,...

He's doing what he does. he picked up, he was using, doing his thing. i haven't really heard from him in a month. it is what it is. it's what he does. nothing i can say or do will change it. if i was out there i would probably be in the same position. i don't listen to nobody either. probably before i leave here he might be back here, who knows? >> mcnee is awaiting trial and if found not guilty, he could have his own chance at a life on the outside. like his brother, he will have to battle his drug addiction to avoid coming back to jail. >> i look in that mirror now, my hair is going gray, i'...

He picked up, he was using, doing his thing. i haven't really heard from him in a month. it is what it is. it's what he does. nothing i can say or do will change it. if i was out there i would probably be in the same position. i don't listen to nobody either. probably before i leave here he might be back here, who knows? >> mcnee is awaiting trial and if found not guilty, he could have his own chance at a life on the outside. like his brother, he will have to battle his drug addiction to avoid coming back to jail. >> i look in that mirror now, my hair is going gray, i'm getting old. i'm starti...

♪ melissa: so you probably guessed being president of the united states or the leader of any country for that matter is no easy job. well a new research shows that it is so not easy that it takes a serious toll on the health of those leaders. the harvard study found the lifespans of heads of states are nearly three years shorter than those of average folks. and it's striking to see how much the job accelerates the aging process. here is bill clinton before and after. he was 4 years old when he took office. look at that his successor george w. bush was 54 when he was sworn in. and president o...