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The last 2 points are very pertinent, I'm all for a fully elected second chamber.
The crux of the question (for me) is borne more from several duels on S & C, I tend to get the overall impression (not neccessarily from here) that the it's ok for religion to rear it's ugly head in an argument so long as they agree with them.
Personally I feel the Arch Bishop has every right to voice his opinions on this (or any) subject, the same goes for Rabbis and Imams ad hom, I don't have to agree with them.