You can live in hope that you will get decent, sane presidents and vice-presidents. But Obama couldn't change much. Like all your politicians (ours too, perhaps to a lesser extent), they are leaned on so heavily by powerful and unelected lobbies - the gun lobby, the pro-Israel lobby, oil companies, financial institutions, the big multinationals - that the significant changes that glaringly need to be made are impossible. You could start with your ridiculous electoral system, which would help to prevent dolts like Trump from being "elected," but that ain't happening either, is it?