Obama says he thinks U.S. influence has been diminishing . The president said the United States is not a world leader and that it needs to be more engaged in international affairs. Obama says it 's too early to discuss potential running mates . Clinton camp says she 's `` fighting hard '' to be nominee , not running mate .
Obama says he thinks U.S. influence has been diminishing . Candidate downplays notion that he is already the Democratic nominee . Obama says it 's too early to discuss potential running mates . Clinton camp says she 's `` fighting hard '' to be nominee , not running mate .