Freek - how would you describe the areas where PVV did well? At first glance, there doesn't seem to be much of a religious element to that map. They did well along the German border in Limburg
Geert Wilders is from Limburg (Venlo). In Limburg they tend to vote for Limburgish candidates.
And Western Noord-Brabant. Areas with more immigrants, densely populated. Industrialized. PVV did especially well in areas with high amounts of white working class people. Low education and fear for immigrants. This also explains why in Rotterdam PVV performs well, and why they don't in Amsterdam. In Amsterdam, the white working class population has left for suburban towns as Almere, Purmerend, Hoofddorp all: PVV largest party. They were replaced by immigrants, and by highly educated, more cosmopolitan people from the rest of the Netherlands. Immigrants don't vote, or they vote PvdA. The higher classes vote D66, or GroenLinks. In Rotterdam, the working class population exodus was not as large as in Amsterdam. There, the higher classes have left the city (for example to Amsterdam).
Ah, yes, the Oldambt. This is an interesting area. It used to be Communist territory (CPN had a majority), until 1990. There were some strongholds where the New Communist Party NCPN was the largest party until ~2002 (the towns of Finsterwolde and Beerta). An area with fertile clay soil, huge grain farms, very rich farmers, and a large population of poor labourers who became communists a hundred years ago. It is still the poorest part of the country, relatively high unemployment. And they are used to voting with the middle finger.
