>> carolyn coburn: three! . >> carolyn coburn: i remember the list-- dun, sara, ditten. >> stahl: the biggest influence on tom coburn's life was his father. after graduating college, he went to work for his dad in the family optical business. you told me in washington that your father was an alcoholic. >> coburn: uh-huh. >> stahl: now, that can't be easy when you say that you had a happy childhood. >> coburn: well, it doesn't take away from the great things that my dad did. >> stahl: did it change you... did it... is it kind of a key to you? >> coburn: mmm, i don't know. >> stahl: but why is it welling up like this? >> coburn: i think clinically, if i were to analyze it, probably didn't do good grieving. >> carolyn coburn: we could spend about a week grieving over all the things we've missed grieving over. that'll be a fun week. >> stahl: at the age of 31, coburn left his father's business and went to medical school. after practicing as an obstetrician for 11 years... >> carolyn coburn: one day, he came home an