There are two sets of European elections this weekend. Everyone wants to know what the Greeks will decide. To my mind the more consequential question may turn out to be: what does France think? Greece poses the immediate threat, but monetary union is a Franco-German construction. To assure its future German Chancellor Angela Merkel and French President Francois Hollande must recast the bargain struck at Maastricht by former German chancellor Helmut Kohl and former French president Mitterrand.