>> as bobby's reputation grows, a young politician decides to join him at the hearings. >> at the time, john f. kennedy is the pretty undistinguished senator, one with great ambition. he becomes part of that investigation and really distinguishes himself thanks to his younger brother. >> mr. hoffa, this bill is not a strike-breaking and union busting bill. you're the best argument i know for it. your testimony here this afternoon, your complete indifference to the fact that numerous people -- >> it makes jack look tougher. he is not just an effete playboy, he is chasing the mob. so this is good publicity for the kennedys. >> receivesnother boost. after a miscarriage and a still birth, jackie gives birth to their first child. >> i want you to meet my daughter caroline and my wife, jackie. >> admired as a principal politician and the family man, the young senator believes his time has come. >> i am today announcing my candidacy for the presidency of