Minnesota Rep. Keith Ellison on Saturday predicted defeat for the state's proposed gay marriage ban.

Voters in November will decide whether to place the state's law which bans gay nuptials in the Minnesota Constitution.

“I believe that the right to marry someone who you please is so fundamental it should not be subject to popular approval anymore than we should vote on whether blacks should be allowed to sit in the front of the bus,” Ellison told Talking Points Memo after a panel on voting rights at Netroots Nation conference taking place in Providence, Rhode Island.

Ellison said his Minnesota campaign staff was working to defeat the measure.

“When we call, we don't call and say, 'Please vote for Keith.' We say Keith is fighting to defeat the voter ID and the anti-marriage amendment. Will you support these efforts too?”

On President Barack Obama's endorsement of gay marriage, Ellison said: “I was happy he did it. Who you marry is your business. That's up to you.”

Gay marriage foes have yet to lose at the ballot box. (Washington state voted to keep a domestic partnership law which includes most of the rights of marriage in 2009.) Voters in four states will decide the issue this fall, including Maine, Washington state and Maryland.