"Polygamy rights is the next civil rights battle." So goes the motto of a Christian pro-polygamy organization that has been watching the battle over homosexual "marriage" rights with keen interest. "We're coming. We are next. There's no doubt about it, we are next," says Mark Henkel, founder of www.TruthBearer.org. Traditional values groups argue that legalizing same-sex "marriage" is a "slippery slope" -- that if marriage is redefined to allow homosexuals to "wed," it will be further redefined to allow other unions, including polygamous ones. Homosexual rights leaders and their allies insist that the "slippery slope" argument is a rhetorical dodge....