A poll has shown public disapproval of a postal plebiscite for marriage equality has increased over the past week.
The latest Essential poll of 1815 voters commissioned by the Guardian found that 47 per cent disapproved of the postal vote while 39 per cent approved.
When a similar question was asked only a week ago, 43 per cent approved of holding a voluntary postal plebiscite followed by a vote in parliament, while 38 per cent disapproved.
Despite concerns that young voters would be less likely to return the postal ballot, in the most recent poll 43 per cent of voters aged 18 to 34 approved of the plebiscite, compared with 25 per cent of those over 55.
The postal plebiscite has been criticised by marriage equality advocates and progressive MPs, who last week lodged a High Court challenge to stop it which will be heard in the first week of September.
While attacking the validity of the postal vote, they have urged the public not to boycott it on the grounds that it will give strength to the ‘no’ vote.
The Senate has twice rejected the Turnbull government’s preferred first option of a compulsory plebiscite on same-sex marriage.