Polling right before the election indicated that the measure was likely to fail and the final results indicated that the pre-election polls were generally accurate:
Results on Minnesota's Amendment 1: 1,507,189 NO 51% to 1,400,668 YES (48%)The opponents to the measure outraised the proponents $11 million to $5 million. Another key feature of Minnesota's battle was that the Yes vote needed to outnumber the number of no votes cast for Amendment 1 and all other races. In other words, the Yes votes needed to be a majority of all the votes cast in the election, which is substantially higher bar than that which occurred in other electoral contests over marriage equality in other states.
It was a big night for progressive causes in Minnesota with not only the anti-gay marriage amendment failing but so did a voter identification amendment and Democrats took control of both houses of the legislature following two years of a rancorous and divisive Republican majority. With a Democratic governor in Mark Dayton who supports marriage equality, as well as a Democratic legislature, Minnesota may become a new flashpoint for passage of state recognition of same-sex couples in the form of civil marriage or civil unions in the next two years.
Congratulations to the North Star State!