Obozo is easily the worst president since World War II. Nobody else even comes close. Not even the hopelessly naive and incompetent Jimbo Carter. Carter never hated America with the passion of Obozo. He was merely an incompetent idealistic boob in the mold of Woodrow Wilson, multiplied by four.
However, Obozo has yet to usher this nation into a Civil War. So James Buchanan (our first gay president) still holds that dubious honor.