Well, there are simply too many good reasons not want to. By taking this up, the Republicans will piss off their business class, which is an important component of their base, particularly when it comes to raising money. They will piss of the the Hispanic community, (They have already done this) and this will cost them dearly. Just like the Republicans lost the black vote for 40 years because of the civil rights movement, if they pursue this they will lose the Hispanic vote for a very long time; Hispanics are the largest minority group in the United States so you don’t want to piss them off. And lastly, despite some of the rhetoric on this page, huge portions of catholics are against this. From catholic seminaries, to charities, to many Bishops, there is very stong catholic opposition to this in the United States. The republican party has done well because it has recently been able to get votes from these three groups. Wise politicians know this is not worth it.
Kendy