The poll of 804 registered voters was done between July 17 and Sunday. It has a margin of error of plus or minus 3.5 percentage points.
In the previous poll, conducted in May, 55 percent of registered said they favor allowing gays and lesbians to marry legally, while 37 percent opposed.
A federal judge last month struck down Wisconsin’s ban, but for a week more than 500 couples were able to get married before the ruling was put on hold.
The case is now pending before the U.S. Circuit Court of Appeals.
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