Among likely Minnesota voters, 48 percent support the amendment, down 1 percentage point from late last month. Another 47 percent of Minnesotans oppose the change, the same as a month ago. Just 5 percent of voters remain undecided. Minnesota law requires any change to the Constitution to capture a majority of all ballots cast. That means a ballot in which the voter skips the question is counted as a no vote, a twist that could become critical in the deadlocked race.