obama family end eight-year residency 1600 pennsylvania avenue friday former first couple bid temporary farewell nation capital follow donald trump swearing-in ceremony.the obamas stand president trump first lady melania trump walk unison toward marine helicopter two couple exchange pleasantries obamas board helicopter quick hop joint base andrews daughters malia sasha await along air force jet next four years know air force one trump board.barack obama address crowd arrival andrews joke michelle really milk goodbye thing behoove brief circle back campaign message hope throughout infuse sense hope blind optimism drive work naivet hope face difficulty hope face uncertainty little pit stop period comma continue story build america add later.via people obama give final thoughts trump presidency comma story build america