Why do you think Obama never served?

Why do you think obama never served in the military. I know you can serve your country in other ways, but military service shows something greater. You put your life on the line for your country, not just your time. I think presidents with military experience tend to be better leaders. Like Washington, Jefferson, Lincoln, Kennedy, Reagan, and so on. There is a whole list of Prez that served here. http://en.wikipedia.org/wiki/List_of_United_States_Presidents_by_military_rank