Marriage equality has been quite the contentious political issue in Australia the last few years. It has been brought up in Australia's Parliament twice in the past and failed. And, it is due to be introduced again this year.
Australian Senator David Leyonhjelm is the sponsor of Australia's marriage equality bill. He has been trying to get the bill up for debate and a vote recently. That debate will occur tomorrow.
Senator Leyonhjelm has apparently received a threatening letter that states that someone should shoot him in the stomach if the bill passes. The (above) letter was posted on facebook by his chief adviser.
From Towleroad:
Above is a letter the senator allegedly received from someone so threatened by equality that they warn him:
"The moment you legalize your filthy practice I would advise you to leave Australia in a hurry. There will be a curse on you and your family. Someone should give you a blast of shot gun. Preferably in the stomach you filthy animal."