Time for gay marriage foes to get the slippery slope treatment

The "slippery slope" argument against gay marriage just won't go away, despite the lack of any evidence that polygamy and bestiality have yet flourished in places with marriage equality. (@dbernstein mischieveously tweeted today: "& we're getting tired of waiting in MA".)

Slate.com's David Weigel just posted an old video featuring presidential candidate Michelle Bachman declaring that, after gay marriage, "group marriage, polygamy, and things much worse may not be far behind." And The New York Times recently posed this question to academics: "With marriage expanding in once unimaginable ways, what might the next stage in this evolution be?

But as marriage equality becomes the status quo in more states, and as the opposition melts down to the religious right, my question is: What is at the bottom of the slippery slope if we deny marriage equality?

According to Right Wing Watch (HT: Joe.My.God), the head of the Michigan chapter of the "pro-marriage" American Family Association thinks companies should exclude gays and lesbians from the workplace, saying, “I would not think of a homosexual person as a good employment risk." Does this mean that a victory against gay marriage would be followed by the repeal of anti-discrimination employment and housing laws across the US?

How about abortion? If same-sex marriage is deemed to be an infringement on the religious rights of fundamentalist Christians, how can we allow anyone in America to legally terminate a pregnancy?

If we have to stop gay marriage to prevent "Almighty God" from "passing judgment" on us (are we talking hurricanes or earthquakes?), surely the government will have to crack down on pornography, premarital sex, contraception, and "genital liberation" for both gays and straights. I see "things much worse" ahead, in Bachmann's words.

I don't see the pro-gay "slippery slope" argument mentioned anywhere, but I think it's one reason why so many straight Americans have become so passionate about supporting marriage quality. They know that the religious right has its own agenda, and it doesn't stop at the definition of marriage.