By my count (doing a quick check online of all the Catholic Republicans in the House and adding your list of Dems), AT LEAST 67 Catholics in the house did NOT sign. These would include:
1. Beauprez, Bob, (R-CO)
2. Boehlert, Sherwood, (R-NY)
3. Boehner, John A., (R-OH)
4. Brady, Kevin, (R-TX)
5. Brown-Waite, Ginny, (R-FL)
6. Camp, Dave, (R-MI)
7. Castle, Michael N., (R-DE)
8. Chabot, Steve, (R-OH)
9. Costello, Jerry (D-IL)
10. Cox, Christopher, (R-CA)
11. Crowley (D-NY)
12. Diaz-Balart, Lincoln, (R-FL)
13. Diaz-Balart, Mario, (R-FL)
14. English, Phil, (R-PA)
15. Ferguson, Mike, (R-NJ)
16. Foley, Mark, (R-FL)
17. Fossella, Vito, (R-NY)
18. Gingrey, Phil, (R-GA)
19. Green, Mark, (R-WI)
20. Gutknecht, Gil, (R-MN)
21. Hart, Melissa A., (R-PA)
22. Hastings, Doc, (R-WA
23. Holden, Tim (D-PA)
24. Hulshof, Kenny C., (R-MO)
25. Hyde, Henry, (R-IL)
26. John, Christopher, D-LA)
27. Jones, Walter B., (R-NC)
28. Kanjorski (D-PA)
29. Kennedy, Mark R., (R-MN)
30. King, Peter T., (R-NY)
31. King, Steve, (R-IA)
32. Kleczka, Jerry (D-WI)
33. Knollenberg, Joe, (R-MI)
34. LaHood, Ray, (R-IL)
35. Lipinski, Bill (D-IL)
36. LoBiondo, Frank A., (R-NJ)
37. McCotter, Thaddeus G, (R-MI)
38. McHugh, John M., (R-NY)
39. McInnis, Scott, (R-CO)
40. McNulty (D-NY)
41. Michaud (D-ME)
42. Murtha (D-PA)
43. Murphy, Tim, (R-PA)
44. Neal (D-MA)
45. Ney, Robert W., (R-OH)
46. Northup, Anne M., (R-KY)
47. Nunes, Devin, (R-CA)
48. Obey, James D. (D-MN)
49. Ortiz (D-TX)
50. Otter, C. L. Butch, (R-ID)
51. Pombo, Richard W., (R-CA)
52. Porter, Jon C., (R-NV)
53. Quinn, Jack, (R-NY)
54. Radanovich, George, (R-CA)
55. Renzi, Rick, (R-AZ)
56. Ros-Lehtinen, Ileana, (R-FL)
57. Royce, Edward R., (R-CA)
58. Ryan, Paul, (R-WI)
59. Shaw, E. Clay, (R-FL)
60. Smith, Christopher, (R-NJ)
61. Sullivan, John A., (R-OK)
62. Sweeney, John E., (R-NY)
63. Tauzin, W. J. Billy, (R-LA)
64. Tiberi, Patrick J., (R-OH)
65. Toomey, Patrick J., (R-PA)
66. Vitter, David, (R-LA)
67. Walsh, James T., (R-NY)
I wonder if there's any chance they can get together and issue a rebuttal letter showing how the clear majority of Catholic politicians feel on the issue. On the other hand, there's a handful of pro-choice Catholic "Republicans" in that list.
Also, the following are pro-life Catholic Senators:
Brownback, Sam (R-KS)
Breaux, John B., (D-LA)
Bunning, Jim, (R-KY)
DeWine, Mike, (R-OH)
Domenici, Pete V., (R-NM)
Fitzgerald, Peter G., (R-IL)
Nickles, Don, (R-OK)
Santorum, Rick, (R-PA)
Sununu, John E., (R-NH)
Voinovich, George., (R-OH)
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).