Looks like there is a slippery slope after all and gay marriage really could lead to polygamy. According to U.S. News and World Report, polyamory advocate Anita Wagner Illig said that gay marriage is setting the standard to make polygamy and polyamory legal. 
“We polyamorists are grateful to our [LGBT] brothers and sisters for blazing the marriage equality trail,” said Illig, who is the head of polyamory advocacy group called Practical Polyamory.
Anticipating the Supreme Court’s decision on same-sex marriage this week, US New’s reporter Steven Nelson interviewed Illig to see how polyamorists and polygamists feel about the possibility of redefining marriage. Nelson reported that Illig admitted “the polyamory community has expressed little desire for legal marriage” until now, but that in light of gay marriage gaining wider acceptance, “more options seem possible in the future.”
Illig insisted that the legalization of gay marriage would set an undeniable precedent for polyamorists seeking legal “multi-partner marriage.”
“A favorable outcome for marriage equality is a favorable outcome for multi-partner marriage,” she argued, because gay marriage would then provide “precedent” for “other forms of non-traditional relationships.”
Illig, whose husband has a girlfriend, believes that the legal acceptance for polygamy would “eliminate a common challenge polyamorists face,” and would be more likely to happen should the Supreme Court rule in favor of gay marriage this week.
Despite denials from left-wingers like CNN’s Piers Morgan  and MSNBC’s Luke Russert,  it’s getting harder and harder for liberals to ignore reality: legalizing gay marriage will lead to legalizing polygamy. Lefty newspaper Slate’s writer Jillian Keenan openly advocated legalizing polygamy earlier this year, and Huffington Post’s Abby Huntsman admitted  that legalizing gay marriage would “open the door” to polygamy “and other things.”
Not to mention, of course, MSNBC’s Melissa Harris-Perry who asserted  that “We do want to change marriage.” With gay couples and now “multi-partner” marriage on the horizon, one wonders whether marriage will even be recognizable by the time the left is done changing it.