More than 375 million eligible voters living in the EU's 27 member states will choose their representatives for the European Parliament, one of the three main decision-making bodies of the Union. MEPs are elected every five years. The vote this week is the largest trans-national election ever held.
Critics mock and sympathizers defend President Traian Basescu's daughter, a model who has now won an EP seat.
Balkan voters gave a thumbs-down to ruling parties in an election marred by record-low turnout.
A large voter turnout is expected in Cyprus, as well as in 33 polling stations abroad.
While President Traian Basescu is urging citizens to vote Sunday, many say the European Parliament election hasn't struck a chord with them.
Sofia Mayor Boyko Borisov's GERB party heads into Sunday's EP vote as the frontrunner, outpacing the Socialists and three other contenders.
Greece's beleaguered ruling party hopes to score a come-from-behind victory against the leftist opposition.
Voter turnout in next week's European Parliamentary elections is likely to be much higher than expected, according to a survey conducted this month.
A Eurobarometer survey found considerable voter apathy concerning the upcoming EP elections, as well as a widespread lack of knowledge about MEPs' contribution to decision-making in the bloc.