Gay marriage supporters won victories in three states: Minnesota, Maryland and Washington State.
In Maine, Question 1 won by a margin of 54 percent to 46 percent, with 49 percent of precincts reporting.
In Maryland, NBC News projected Question 6 to pass 52 percent to 48 percent, with 93 percent of precincts reporting.
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In Washington State, Referendum 74 also passed by 52 percent to 48 percent, reports the Associated Press.
However, Amendment 1 in Minnesota was behind 54 percent to 52, with 67 percent of state precincts reporting, reports the Minneapolis Star-Tribune.