Argument: The Lisbon Treaty threatens the sovereignty of EU states
Sally McNamara. "The EU Reform Treaty: A Threat to the Transatlantic Alliance". Heritage Foundation. February 20, 2008 - The new Treaty poses the biggest threat to national sovereignty in Europe since the Second World War.
[...]A Democratic Deficit
Europe doesn't need a constitution. The European Union is not the United States of Europe. The EU is a grouping of 27 independent nation-states, each with its own culture, language, heritage, and national interests. The EU works best as a single economic market that facilitates the free movement of goods, services, and people. It is far less successful as a political entity that tries to force its member states to conform to an artificial common identity.
The European Constitution and its successor treaty are all about the centralization of political power in the hands of a gilded ruling elite in Brussels, not the protection of individual liberty. They are also based on the principle that sovereignty should be pooled by nation-states for the "greater good" of Europe, a concept that goes against the grain of modern history, as witnessed with the break-up of the old Soviet Empire.
"An alternative guide to the Lisbon Treaty". Sinn Fein, Liberal Irish political party. - It gives the EU too much power and reduces our ability to stop decisions that are not in Ireland’s interests.