The current 68,111 vote lead for 'Yes' projects to a 149,614 margin of victory once all the votes are counted. Yesterday was a great day for civil rights.
Because of the heterogeneity between precincts and the self-selection property of voters who mail their ballots on election day (you know who you are!) it's impossible to come up with a good confidence interval around that 150k margin, so I can't make an Official Call.
But it looks very very good for marriage equality.