From what I understand, the first one was to allow gay marriage. It didn't pass.
So the liberal who failed on his first attempt tried a 2nd attempt using stronger language (banning gay marriage) in hopes that it wouldn't pass and open the door for homosexuality in the wedding chapels.
It is basically the same thing, but he was hoping that rewording it would make a difference. I'm glad to see it didn't, but it was a lot closer.