When writing a biography speech...please help!?

I'm writing a biography speech on Barack Obama. I was wondering, what are some 3 GOOD MAIN TOPICS to speak about with him. For example...I can talk about his childhood. BUT WHAT ELSE!? lol. Theirs just so much to choose from that I just wanted everyones opinion. Please! Thank you! Thank you! Thank you!

Public Comments

1. anything in his high school and college years to prepare him for this job? What did he major in? What kind of activities did he do ( young Democrats maybe?) any military service ? any political experience? What are his main platform stands?What is he for or against? Does he have any unusual ideas? Has he been involved in any controversies?