Being elected senator from Illinois, for starters,
Being elected president, of course. That was a REALLY BIG DEAL for Blacks.
It is not up to you to decide who is Black, by the way. He would not be mistaken for a White person by any American. Therefore he is Black. And of course, his wife is 100% American Black, and so are his children.
He has been an inspiration to Blacks, just as Kennedy was an inspiration to Irish and Catholics. He has given some very effective and insightful talks on race during his presidency which you would never understand, and he has at least brought down two wars to a point where very few of our soldiers are getting killed. He saved the American auto industry, which McCain would not have done, and he has avoided armed conflicts.
And of course, the economy and the Stock Market were in terrible shape when he took over and the Stock market has risen over oits highest point and employment has improved. And now no one will have to go bankrupt because or previous health conditions.