Personally Opposed, but Sleeping with the Enemy

If you were truly opposed to something, then you would try to defeat it, especially if your conscience tells you that this something is both a moral wrong in itself and disastrous in its consequences. Now, it might be that, for various reasons, your desire to act to defeat this something is thwarted, or that your action would lead to more harm than good. One thing is certain, though: it would make no sense whatsoever to work with diligence for the very thing you oppose, and to cheer its victory. Yet this course of action is routinely followed in public life by the “personally opposed, but…” contingent. It has long been so with abortion; now marriage has joined the list.

http://www.thepublicdiscourse.com/2012/02/3940