In particular you could do likewise by following Australian Marriage Equality's link.
I chose to write to C Pyne, as a prominent SA Liberal politician ( or another similar) along the following lines
You might like to write to Pyne (above), or Birmingham or similar .Dear Mr PyneYou are more than well-aware that the nation is paying close attention to the discussion in your Party room next week about Marriage Equality.I happen to be a priest of the Anglican Church, and along with a number of my colleagues am steadfastly in favour of Marriage Equality. Many Christians are in favour of this moveI also recognise, sadly, that it is unlikely that internal processes within a number of Christian Church's themselves will allow this to happen within Church ranks.Yet this does not mean, I suggest, that our Nation as a whole should not go forward .It seems unlikely to me that, as a priest, the Anglican Church will allow me to pray for God's blessing on the marriage of same-sex partners who clearly wish to make a lifelong marriage commitment to each other and their children. This is to the Church's shame.I am sorry that, as a Commonwealth, we have got stuck, largely because the plebiscite as a process is clearly not going to work!This is so atrociously political on all sides as to be offensive.I think it is incumbent upon the party of Government to move to break this impasse and exercise leadership.The community is more than tired of the petty-politicking and I urge you and your colleagues to move definitely to resolve this.[I think the 'Dutton Postal Vote' option is just a bizarre distraction, and cynical in the extreme. Non-compulsory, non-binding. In other word 'non helpful' & 'non useful']All the best andRespectfully,Stephan ClarkParish Priest: St Mary Magdalene'sAnglican Church, Adelaide.
Birmingham seems to have become such a 'creature of the machine' which is deeply sad as he is creative thinker and should do better