the problem with gay marriage is the problem with marriage as a whole... that it is essentially an archaic, religion based institution. If people want to get married in a church, they can abide by whatever rules their church imposes, but the state has no business getting involved in any of this.
What should be available to all people, regardless of orientation, are civil unions -- those would convey all the legal rights and benefits that marriage confers.
Of course, if this idea ever goes anywhere, the wingnuts will go back to accusing gays of "destroying marriage." It should be destroyed -- at least as a government-sponsored institution.