Right now they are doing it through the courts....what if they had the authority to do a Constitutional amendement? You think it’s bad now....sheesh.
That's just the purpose of an Amendment process: it takes time for the People to develop a consensus, and to do so, there must be a dialog and involvement of the state legislatures. This way, the People will not overturn the social order without being convinced of the rightness of it, as they were when they were willing to fight a ghastly Civil War to affirm the basic human dignity of African-American people.
The gay lobby knows it cannot win at the ballot box now, in no small part because of their own overreaching demands that small children be indoctrinated in government schools from kindergarten onwards about the mechanics of gay sex, instead of, say, requiring that school guidance counselors be able to make a referral to a counselor, with the permission of the parents, of a high schooler who thinks he or she might be "gay."