Way to go, Lutherans!
I'm a member of my Church Council, and attended a Synod Assembly in June, so I know how intense the debate over this is in the church. Conservatives are very upset about it, but liberals are thrilled. The church will undoubtedly lose some members over this, which is very unfortunate. There will be something of a schism.
But the far more important fact is that a very old wound has been healed, and much pain can now be put behind us. We aren't completely there yet: the ELCA still does not recognize gay marriages. But we can now say: Welcome one step closer to the center of the church, gay brothers and lesbian sisters.