Polls predict candidates that want to slash the EU's powers or even abolish it could scoop up a third of the seats _ an unprecedented showing of popular disillusionment with the EU. When official returns are known Sunday night, they could portend changes in EU policy in areas ranging from immigration to a new trade agreement being negotiated with the US.
Europeans in seven other nations have already voted. Unofficial exit polls reported a surge in support for Britain's anti-EU UKIP party. In the Netherlands, however, the right-wing Euroskeptic Party for Freedom dropped from second to fourth place, polls found.