When Rudd was elected in 2007 he said he wouldn't change the Marriage Act in his first term, but agreed to hold a parliamentary vote if Labor was re-elected in 2010. Gillard then took over as PM and refused to change the party policy.
Why? Rudd says because "one of the factions which supported her leadership bid, the [SDA, a union for retail, warehouse and fast food workers], are deeply conservative, deeply Roman Catholic and deeply hostile to any change in the Marriage Act".
Rudd has been involved in the "yes" campaign, talking about his godson who was allegedly punched by someone pulling down rainbow flags in Brisbane.
He's sent out messages for the "yes" campaign in Mandarin, explaining to the Chinese community why they should be voting yes.
"I cannot for the life of me understand why Turnbull doesn't simply do as I promised to do in 2013 which is open it to a vote in the parliament, let the parliamentarians vote the way they want, the thing will pass, end of story."