GAW: I looked into it, and civil union in the US aside from being invented to give these abominable people a marriage equivalent, the laws in all the states that have it (except one) specifically limit it to same sex couples. So it is specifically designed for these deviants.
Instead of supporting this outrage you should support reinstatement of the sodomy laws and even institution of the death penalty for these sodomites. (Just as our Torah describes and the Reb Moshe writes in the Igros Moshe [O.H. 4:115] “It is one of the most debased sins and it even is prohibited for non?Jews.”)