I think Christians need to be involved in politics individually and do, on ocassion, need to speak out on clear biblical moral issues (I would include sanctity of life, sex immorality, and religious freedom to be examples of this).
I also think there is room for lower level eccumenical contacts that are firmly limited in the above way.
It seems to me the NAE has crossed the line, has some time ago, and is not even a clear witness for the gospel of Christ any longer, let alone clear biblical precepts. It has continued on a trend away from, rather than toward biblical precepts.
The issue referenced is couched in ambiguous language, obviously reflecting compromise, and does not commend clarity, let alone moral authority.