This is a very interesting quote from historian Gary Wills:

I think one of the things that may be hindering him is that he’s so aware that he is the change — that it’s such a break with our history to elect a black President — and that’s such an odd thing to some people and that’s why they’re calling him “not an American” or “socialist” or “fascist” or whatever — that he wants to emphasize continuity almost to a fault. So even though he came to national attention by opposing the Iraq War, he appointed his Secretary of State (someone who voted for the Iraq War), his Vice-President (someone who voted for the Iraq War), his Secretary of Defense (someone who conducted the Iraq War), the two generals in Afghanistan (who conducted the Iraq War). That’s continuity, all right! But is it the continuity that we need?

(emphasis mine)

I don’t know if this is accurate, but this thesis is consistent with what we have observed over the past 6 years.