ELCA (the Evangelical Lutheran Church in America: 4.6 million members) approved this resolution on 21 August 2009, by a vote of 559 to 451, at their biennial Churchwide Assembly in Minneapolis. Previously, celibate homosexuals were allowed to be ordained. Now, it is required that a commitment to one (sexual) partner is the norm.
By so doing, it has removed itself from historic Protestant orthodoxy and moral teaching and makes inevitable a schism within the ranks that may be as momentous as that which has plagued Anglicanism, for the same reasons.
The Lutheran Church - Missouri Synod (LCMS) has denounced the decision, as have the Wisconsin Evangelical Lutheran Synod (WELS), and the Evangelical Lutheran Synod (ELS).
For the biblical, historic Christian teaching on homosexuality (on which all Christian bodies used to be united until recent times), see:
Dialogue on Homosexuality (Dave Armstrong vs. Sogn Mill-Scout)