According to a poll released Wednesday, a slim majority of Minnesotans support a constitutional amendment banning gay marriage.

The SurveyUSA poll commissioned by the Minneapolis-St. Paul ABC affiliate KSTP found 51 percent of respondents in favor of the amendment, 40 percent opposed, and 8 percent uncertain.

“This is a significant change from our last poll in March when 62% favored the amendment banning gay marriage and 33% were opposed,” the polling group said in announcing its findings.

It is the first poll to gauge Minnesota voter's opinions since lawmakers approved the amendment on Saturday, sending it to voters for their approval in 2012.

A Star Tribune poll released last week found a majority (55%) of respondents oppose the amendment, while 39 percent favor it.

A poll commissioned by the National Organization for Marriage (NOM) and the Minnesota Family Council, the leading proponents of the amendment, found greater support for the amendment. Fifty-seven percent of respondents said they would vote for the amendment compared to 41 percent who would vote against it.