Support for the Indigenous Voice to Parliament has fallen below 50 per cent in News South Wales according to data commissioned by the Sydney Morning Herald.
The Resolve Political Monitor survey found it dropped from 53 per cent in May/June to 49 per cent in June/July.
Support has also decreased in Victoria from 56 per cent to 52 per cent.
The data suggests Tasmania is the only state where the majority of residents back the Voice by 54 per cent but the sample size was notably small.