Currently it is legal in California for a gay couple to marry. However, there is currently a bill being discussed which, if passed, would bring an end to that right. Now, I seriously doubt it will pass, but the LDS church is encouraging it's California members to vote for it.
Here is the Fox13 news report: LDS Church Stands behind Calif. Anti-Gay Marriage Ballot
Watch this video and then decide for yourself. Just remember that the church has a history of being racist, anti-feminist, and anti-gay. Just because they believe something, they think they have to force it on everyone.