Michigan State economics professor Charles Ballard directs the quarterly State of the State Survey, which questions Michiganians about a variety of subjects. He said the increase in state support for same-sex marriage mirrors trends around the country.
The telephone poll of 1,015 Michigan adults was conducted June 12 to Aug. 13, and the results have a margin of sampling error of 3 percentage points up or down.
Opposition to gay marriage stood at 39 percent in this year's poll. Two years ago, 51 percent said they opposed gay marriage, while 48 percent supported it.