Look at this online petition and notice the signatures. They are indeed from that "usual gang of suspects". They complain about Sarah Palin and Newt Gingrich using "inflamatory statements" while refusing to see that the building of this mosque is itself an inflamatory statement.
Here are some of the Catholic organizations represented:
Institute of the Sisters of Mercy of the Americas
Leadership Conference of Women Religious
Maryknoll Office for Global Concerns
Conference of Major Superiors of Men
Center for Christian/Muslim Understanding, Georgetown University
Moreover, this petition is on a site hosted by Faith and Public Life. I linked to this site from America magazine. Here's the article. I would urge these people to take off their rose-colored glasses, but I do find it difficult to believe they really are that stupid. That begs the question - what does motivate them?