It's been 13 days since the ABS began sending out marriage equality postal survey forms -- and there's 43 days to go until the survey closes, another eight on top of that until we will know the result.

The latest Newspoll numbers don't look good for the Yes campaign. Support for changing the law to allow same-sex couples to marry has dropped from 63% to 57%, with opposition moving from 30% to 34%. These numbers are similar to those found by Essential Research. Interestingly, however, the Essential poll found that 36% of respondents said they had already sent their forms back, while just 15% of Newspoll's respondents said they had.