With the general election set for Wednesday 9 June, mainstream parties are worried by the prospect of the extreme-right Freedom Party (PVV) becoming a major force in the new Dutch Parliament.
Having only won nine seats in the 2006 election, Geert Wilders’ party could even become the largest party in Holland, polls show.
A February poll by the Dutch pollster Maurice de Hond showed that Wilder's anti-Islamist party could just about clinch a 26-seat majority in the next general election, ahead of the Christian Democrats (25) and the Liberals (23).
The Freedom Party fared extremely well in the 2009 European elections, winning four out of 25 Dutch seats.
In municipal elections on Wednesday (3 March), the party came out on top in the city of Almere and came second to the Labour party in the Dutch political capital, The Hague.
The party, which describes itself as anti-Muslim, wants to introduce an immigration ban of five years for immigrants from non-Western countries, and a five-year ban on the founding of mosques and Islamic schools.
Wilders spoke in the Get Down café in Almere after Wednesday's win about the fact that Muslims did not have to fear the PVV.
"If they abide by the law, then they have the same entitlements as anyone else, and have no reason to be afraid."
The big loser in the forthcoming ballot is likely to be outgoing PM Jan-Peter Balkenende, who has been in power for eight years and was a serious contender for the job of EU Council president, which eventually went to Belgian Herman Van Rompuy.
Dutch MEPs contacted by EurActiv confirm that Wilders' gains are substantial and worrying.
They will be holding debates in Brussels on how they will try to reconcile their coalition government to prevent a right-wing backlash, according to sources in the legislature.