I don't think you are against legislating morality, just against legislating moral stances that you happen to disagree with.
Some people have decided that racial or sexual discrimination is morally wrong, and have imposed their morality upon others by law. I, personally, think that people should have freedom of association, and that this means that an employer who doesn't feel like hiring blacks, women, or left-handed Armenians should not be forced to employ people he doesn't want to, and that business people who don't feel like doing business with gays or redheads should be allowed not to. The law says otherwise. From my viewpoint, that is legislating morality. Do you disagree?
In this case, Romney, as an officer of his church, told a woman that she could not keep a child born out of wedlock (and which she could not afford to support without church assistance) remain a member in good standing of the Mormon church. He was not putting a gun to her head, he just laid out the criteria she needed to follow in order to remain a member.
The above does not mean I like Romney as a candidate, or like the Mormon church, just that I think the Mormon church has the right to decide who to keep around.
What ticks me off is people who demand freedom without responsibility.
PS, I never said Romney as the candidate will enact laws similar to the teaching of the LDS. My only concern is that Obama or his goons will use Mitt's association with the LDS against him. Heck, Obama went after those clinging to their Bibles. #withNewt