washington u.s. president barack obama pledge wednesday work smooth transition power president-elect donald trump republican winner tuesday election promise undo obama top domestic foreign policy initiatives brief remark reporters white house rise garden obama urge fellow democrats put aside disappointment try strike positive tone devastate electoral defeat secret president-elect pretty significant differences obama say smile trump long question whether obama bear unite state eligibility office root success unite lead country obama say obama wife michelle campaign hard democratic candidate hillary clinton defeat trump acknowledge president legacy healthcare climate change financial reform line obama keep remark wednesday focus ensure successful transition trump note republican predecessor former president george w. bush do eight years ago everybody sad side lose election day remember actually one team obama say want make sure handoff well execute ultimately team obama say obama trump victory root success