A poll released Wednesday reported a four percent drop in support for allowing gay couples to marry in Michigan.

The poll, conducted by Lansing-based EPIC-MRA exclusively for the Free Press and WXYZ-TV, asked 600 likely Michigan voters how they would vote on allowing same-sex marriage. Forty-seven percent said they would vote “yes,” while 46 percent said they would vote “no.”

A similar poll conducted last year found a slim majority (51%) of respondents in support of marriage equality.

In March, a federal judge struck down Michigan's marriage ban. An appeals court in Cincinnati will hear arguments in the case on August 6.

(Related: Appeals court to hear arguments in Michigan gay marriage case on August 6.)

In a blog post, the National Organization for Marriage (NOM), the nation's most vociferous opponent of marriage equality, said it was not surprised by the poll's findings.

“[T]hese poll results don't surprise us,” the group wrote. “Overwhelmingly, in the majority of cases when voters have been given the opportunity to vote on marriage, they have expressed the view that marriage should be defined as the union of one man and one woman.”

Of course, a majority of those votes were cast a decade ago, and most polls, including Wednesday's survey, report overwhelming support among adults under 34.