I respect their their right (and anyone else's) to vote from their conscience. That's what a democracy is about. But where, oh where do they get this rubbish from. It most certainly wasn't their minister.
One of the strangest arguments I have seen over the years with this debate was actually during the time NZ was changing their laws, and I have a very evangelical acquaintance on facebook. When the debate as normal went to marriage being for the purpose of procreation, and I asked the question of those that are unable to conceive in heterosexual couples, I was informed that God was punishing those people for sins they have done in their life. I cannot imagine any minister, or religion I would want to know about anyway, teaching that!