Minnesota Democrats opened their 2012 state convention on Saturday with an appeal against a proposed gay marriage ban.

The Minnesota DFL included a rainbow flag in addition to the customary American, Minnesota state and POW/MIA flags in its presentation of the colors, the Star-Tribune reported.

Voters in November will decide on the amendment which would define marriage as a heterosexual union in the Minnesota Constitution. The resolution which put the question on the ballot was widely supported by Republican lawmakers.

“Maybe the GOP should stop focusing on gay marriage and concentrate on their own marriages first,” said DFL Chairman Ken Martin, a reference to former Senate Majority Leader Amy Koch, who resigned her leadership post after it was revealed that she was involved in an extramarital affair with staffer Michael Brodkorb.

U.S. Rep Tim Walz, the first elected official to address the convention crowd, said of the amendment: “It's anti-Minnesota. It's immoral and we will defeat it this November.”

State Democrats also endorsed U.S. Senator Amy Klobuchar for a second term. She accepted the endorsement with a pledge to fight for what's right.