THE Labor Left will take on the Prime Minister, Julia Gillard, over gay marriage by pushing the party to adopt a policy of outright support rather than a conscience vote.

Firing the first salvo ahead of the ALP national conference in three weeks, the federal minister and senior figure in the Left, Mark Butler, said a conscience vote should not apply to same-sex marriage because it is not a ”life-and-death” issue like abortion, euthanasia or stem cell research.