People in the Irish Republic are voting in a referendum on whether to ratify the European Union reform treaty, in a poll anxiously watched across the EU.All other 26 member states have left the issue to their parliaments, but Ireland is obliged to hold a popular vote on changes to its constitution.
All of the main Irish parties back the treaty but the No campaign has been putting up a strong challenge.
With many voters undecided, opinion polls suggest the result will be close.
The document, known as the Lisbon Treaty, replaces a more ambitious draft constitution that was rejected by French and Dutch voters in 2005.
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