I think most sane people agree its whacky for people who claim to live a code based on the ten commandments give such cover for an admitted unrepentant adulterer, sexual assaulter, sexual harasser of underage girls, cheat, coveter of other's goods (just for a start).
But most fundy Christians have decided better that than mandatory insurance policies covering (shudder) IUDs, or the fed courts saying gays can get married in courts or churches that LIKE gay weddings, and MORE IMPORTANTLY, that there is some political solution to the worldwide fact that a greater majority of people are concluding that a divine being does not guide everyday events to reward those who worship him/her/it.
There's no compromise with that. It's a small minority that is getting smaller. There are other issues that reasonable people can compromise on … immigration, deficits, healthcare, etc. So far, both parties have not gone for a big compromise that would cost their base what they really don't want to give up (like more latino babies who will be voters, or decent wages and recognition of guest workers) that would make the other party's position completely untenable. Maybe some day they will. Or maybe the Republic will fail because politically we can't solve real political issues.