US President Barack Obama has delivered his final presidential address to the nation, ten days before leaving office. The outgoing president made his farewell on Tuesday night in Chicago, the city where he began his political career. The occasion marked the unofficial countdown to the end of his term of office. He recast his original campaign refrain of "yes we can" as "yes we did", and listed the landmarks of his presidency. He also looking back at his legacy after eight years in office.