While yes the polls have been quite strongly in favour of Marriage Equality passing, this is by no means a sure fire thing. While I do believe it will ultimately pass, one of the greatest worries regarding this is that young individuals most strongly support Marriage Equality (the university where I'm the Deputy Auditor of the LGBTQ+ Society had a 97% vote in favour of Marriage Equality and registered over 4,000 people to vote) yet there is a very real fear amongst many that this age group will not turn up to the polls, given the historically low turnout in this category. This, combined with apathy brought about by previously strong polls in favour of a Yes vote as individuals feel it's a certainty whether they vote or not, and the passion among No voters ensuring that they'll head to the ballot (particularly when elderly individuals have a much higher turnout) is quite a worry. When combined with a poor performance by the "Yes" side on the most recent Prime Time and Vincent Brown debates which are rather crucial in swaying undecided votes, has me particularly worried. In addition, the fear of individuals saying they're going to vote yes when in reality they will vote no is very real, given the backlash many public supporters of no voters have faced and the persecution complex which has developed (there are, literally, posters encouraging individuals to vote no for freedom of conscience).
While the no side has managed the campaign very poorly (understandably, they have nothing to work on), the result of the Divorce referendum still lingers when every poll was so strongly in favour of divorce passing and, ultimately, it passed only by the slimmest of margins. In saying that, I do strongly believe that it will pass, but I definitely do not thing it will be a roaring victory by any means.