ChristenUnie is slightly more left wing than CDA in social issues, more conservative in moral issues, and eurosceptic.
You were not using the American definition of a "social issue" here, methinks. Define social vs moral issues, plz. Also, what about their economic stance?
I wasn't aware that there is a difference in the European and American definitions of social issues.
Moral issues: the typical things for a christian party. Abortion, euthanasia, drugs, pornography, homosexuality. CU is against all of these. Officially CDA is against too, but they don't make a fuss about it. CDA hasn't attempted yet to turn back the liberal abortion, euthanasia and drugs laws, although they are not too happy about it. I would be amazed when CU takes part in a cabinet with no policy change in at least one of these subjects.
Social issues/economic stance: The Balkenende cabinet has initiated an unprecedented serie of reforms in social welfare. Unemployment benefits, early retirement, health insurance, benefits for people unable to work. It all became too expensive. Also the immigration laws are stricter now. CDA was for these plans, CU is staunchly against.
CU calls themselves a christian social party. They would fit perfectly in a CDA/PvdA/CU cabinet, I think.