I can understand your entusiam Swede,but I don't think one black President will do much to change Americans attitudes,in some areas in might even make them MORE prejudiced.
Intrinsically the US is a racist /sexist/homophobic nation,and will take more than one black president to alter that.Americans are not just anti black, but anti anything different to the White Anglo Saxon Protestant principles.
I too hope that Barrack Obama may open peoples eyes to realise that skin colour/sexual preference etc will make some difference,but as I know the US quite well I don't hold out much hope.
For his 4 year term(and maybe another 4 years after) there may be a long period of hope/honeymoon,but America has a history of falling back into a George Bush type mindframe after experimentation.
As I am 85,I don't suppose I shall see if works or not.