Billy, where did you get the list of Catholic House Republicans? I was searching through Google for a list of Catholic congressmen and got bupkus.
You're right, the list of Catholic House Republicans includes several pro-abortion RINOs who would never write a letter in support of the bishops. One of them, Sherry Boehlert of New York, is so sick that he even opposed the ban on partial-birth abortion (I really hope he gets taken out in the GOP primary this year; he nearly lost in the primary in 2002).
http://www.yourcatholicvoice.org/index.php?id=congress
That's a list of all the Catholics in the current Congress, both parties. I just went through and deleted all the Democrats on the list, sans the ones you listed as refusing to sign the petition.