Not sure why the Mormons would have to go into damage controle?
Mormons have the right to one vote, the same as everyone ells of voting age.
The leaders of the LDS faith, will never condone homosexuality, but I'm sure will continue to love the sinner, but not the sin, as Mormons, and just about all "Christian faiths" see homosexuality, and bisexuality, they are not on their own. The Church of "Jesus Christ" of latter day Saints, are never going to accept homosexual marriage, withing in it's Membership.
If the whole of Mother America was to legalise homosexual marriage today, in the US of A, and members of the LDS faith were to partake,and consulate that union, they would be excommunicated; rules to their membership. They would not recognise homosexual marriage, within it's membership, and to be a Mormon, you can not have sex outside of marriage, and to do so you get excommunicated; providing you are not a Jack Mormon, and that comes down to living a lie.