Weeks of debate on same-sex marriage may not have shifted Australians' votes on the issue, according to a poll that has found 60 per cent support for change.

The survey taken by YouGov on the eve of the plebiscite result found that hearing the key arguments for and against allowing same-sex marriage "appear to have very little impact on whether respondents support it" according to an analysis by the US Studies Centre at the University of Sydney, which commissioned the survey.

The Sydney Morning Herald reports on the findings of the opinion survey conducted by YouGov PLC as part of an ongoing partnership between USSC and YouGov.