No, it can’t be aruged that BHO had no political experience. He was a state Senator in IL, then elected to the US Senate before taking over the WH. (my choice of “taking over” is deliberate).
What did Bammie learn, what did he do, what bills did he sponsor, or what possible benefit did it do anyone for him to hold these offices?
Except perhaps to learn the low down dirty and crooked political tricks that are common in Chicago and Illinois.