The Dutch have been counted among the staunchest supporters of European integration ever since the parliamentary ratification of the European Community for Coal and Steel in late 1951. The major political parties—the Christian Democrats (CDA) and its forerunners, the Labor Party (PvdA), and the liberal parties VVD and D66—supported all important European treaties of the past decades. Only the smaller orthodox-Calvinist parties, some smaller left-wing parties, and, more recently, the List Pim Fortuyn (LPF) have opposed these treaties in parliament. This overwhelmingly large support in the Second Chamber of the Dutch parliament included the Treaty of Rome of 2004—the treaty establishing a constitution for Europe. One hundred twenty-eight out of 150 members of parliament favored the ratification of the European Constitution. This article draws on several chapters in Aarts and van der Kolk 2005.