COPENHAGEN- Who can get excited about a bridge? But if it were just a bridge it would have been built a long time ago. This bridge that links northern Europe with the Scandinavian land mass is a political statement, almost as powerful, if not quite, as the creation of the Euro, the single currency, to the south. Indeed, a Scandinavian decision to accede to membership of the Euro should by rights follow as a logical next step. That both Denmark, which votes on the issue next month and Sweden, the two mother countries of the bridge, have serious reservations about joining the Euro is, in modern dress, the debate they had about building the bridge, a debate that consumed over a century of argument and discussion. But the bridge is now there, opened last month, a graceful object crossing 17 kilometers of the sound that adjoins the Baltic sea. The Danish...