Well, depending on the sort of other laws you've supported, that shouldn't be very surprising.

The special interest of a particular group always result in far more intense support than any law that benefits the public at large. And privacy is usually a general concern.

Also, am I the only one who finds the idea that you need to demonstrate the existence of political capital to elected politicians concerning? (As opposed to persuading them that it's the right thing to do.) I don't want to sidetrack the whole discussion, but this makes me doubt the future of western democracy in a hundred different ways.