Clinton is much better able to handle the rough and tumble, Obama seems to have neither the patience nor the horse-traders sense of the possible.
I submit you don't know the man, Q. In another Obama thread I posted a link to the New Yorker character study on Obama which gives quite the contrary impression -- he is an expert horse-trader and completely calm in the face of clashing ideas. I hope you find and read it.
I also think he will add energy to the dialogue in a way that will actually reduce the fractiousness in the process of legislation.