Not in Australia's case. We're a free and secular society who choose not to allow gay marriage because...errr...I'm not sure there has ever BEEN a reason given.
We had an atheist PM, although we now have a very conservative and traditionally religious PM. Both have shown no ability to listen to the will of the people on this issue, and the people (frankly) haven't made it enough of an issue. So whilst there's broad support for marriage equality, it just doesn't seem a strong positive vote getter.
Instead she talked about how important 'conservative values' were to the building of this country. Which means how important centrist votes from older generations were for her chances of retaining office, I suppose.
Bah...still makes me want to vomit.
The ONLY defence I've seen of her position that isn't pure conservatism/religious in nature was actually a feminist perspective that spoke of not strengthening the patriarchal institution of marriage. Which I found politically naive apology, and overly reliant on particular versions of marriage to draw conclusions (Christian in the case of the article I read). Double bah!
Marriage can certainly be a patriarchal institution. Banning lesbians from it is hardly going to help break that down.
Would they argue to ban all people from it? No...let's just not add to the group doing it right now.
Let's ignore the legal differences in place for married versus unmarried couples.
Triple Bah!
*steps slowly away from soapbox*
Errr...yeah...so...