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Excluding the evangelical and other Christians who also tend not to endorse same sex marriage.

And, Catholics are not the only religion not supporting, or endorsing same sex marriage.

Did he say that?

Yep. Religious institutions [[in addition to Catholics) better take heed, some will argue.

They must come "on board" or be prepared to be silenced, as they are tax exempt and thus ultimately...

Not necessarily. Again the 'tidy' partisan template fails to be water-tight; exclusively descriptive. There are others [[including dems and indies) who question the long term outworking[[s) of SSM.