I come to Berlin as so many of my countrymen have come before. Tonight, I speak to you not as a candidate for President, but as a citizen–a proud citizen of the United States, and a fellow citizen of the world. […] People of the world–look at Berlin! [L]ook at Berlin, where a wall came down, a continent came together, and history proved that there is no challenge too great for a world that stands as one. […] [H]istory reminds us that walls can be torn down. But the task is never easy. True partnership and true progress requires constant work and sustained sacrifice. They require sharing the burdens of development and diplomacy; of progress and peace.
— Barack Obama, Speech in Berlin, Germany, July 24, 2008.
A Citizen of the World indeed!