And, as you can read here http://www.peil.nl/?1782 , Labour has to choose. As CDA loathes Labour and vice versa, they will probably go for a coalition with the VVD, which makes a vote for Labour a vote for a left wing coalition, whether they like it or not (define or be defined). I'm not sure such grandstanding would help the CDA though.
And don't forget the Christian Union and D66 might join a left-wing coalition. Not very realistic, but not out of the question either.