In my experience, Lds are AWOL -- and have been -- from most pro-life groups. Now I'm not saying they're not by and large mostly pro-life. I just haven't seen that "political involvement" there that you're talking about.
Re: state ballot initiatives defending marriage as between one man and one woman, they DID get involved in two such California initiatives. (So high five to CALIFORNIA Mormons on that).
But such initiatives have been on the ballots in other states...and haven't heard anything about Mormons beyond California.
Butt...
Just WHO has infiltrated whom???