An excellent article in Slate making exactly the same sort of arguments the LDP makes regarding marriage, gay marriage, and the involvement of the state in both. The article’s conclusion puts it very well:
Marriage is an important institution. The modern mistake is to think that important things must be planned, sponsored, reviewed, or licensed by the government. The two sides in the debate over gay marriage share an assumption that is essentially collectivist. Instead of accepting either view, let’s get the government out of marriage and allow individuals to make their own marriage contracts, as befits a secular, individualist republic at the dawn of the information age.
Thanks to Skepticlawyer for bringing it to my attention.