Nate Silver runs the numbers on the state's 2012 anti-equality ballot measure:
The Minnesota measure, which would ban same-sex marriage but not domestic partnerships, should be considered something of a tossup. Under the Accelerated Model, it would fail with about 49 percent of the vote, while under the Linear Model it would pass with 54 percent — both forecasts well within the models’ respective margins of error.
One additional factor, however, is that Minnesota rules require a majority of all voters to cast a ballot in favor of a constitutional amendment in order for it to pass. So someone who turns out to vote next November and punches her ballot only for the presidential election is essentially a “no” vote. Historically, about 5 percent of Minnesota voters undervote constitutional amendment proposals despite casting ballots for other races, so what this means is that the ban on same-sex marriage will de facto need something like 52 percent of the vote in order to pass. For this reason, I’d conclude that the Minnesota measure is a slight underdog.
The Dish 