Labor plans ignore the naysayers and to go all out to support the "yes" vote on the postal plebiscite on Gay Marriage.

Federal opposition leader Bill Shorten will acknowledge the obvious:  That the plebiscite is expensive, unscientific, and could lead to a very negative campaign by the "no" side which would harm LGBTI folks.  However, Labor supports marriage equality and will fight for it in any forum, despite putting human rights up for a vote in a popularity contest.

"This government has decided gay people should be subject to a different law making process," Mr. Shorten said in Parliament.  "They think that LGBTI Australians should have to ask permission to be considered equal from Australians who will not even see the law that they are casting an opinion on."

Greens leader Richard Di Natale also thinks the postal plebiscite is a ridiculous idea, but says that supporters of same-sex marriage should register to take part in it anyway.

"Enrolling to vote is a win-win.  We are hoping that the shonky postal plebiscite is knocked off by the upcoming court challenges, but you'll want to be on the roll in case it isn't.  And even if the plebiscite is knocked off, you'll want to be able to vote to kick this government out at the next election for playing politics with our human rights," he said in a statement.