The Independence Party of Minnesota, one of three political parties in Minnesota with major party status, announced on Tuesday that it is joining the campaign to defeat a ballot measure that would place a ban on marriage for same-sex couples in the Minnesota Constitution if passed by the voters in 2012. The party announced shortly after the Minnesota Legislature passed the ballot initiative that it opposed the amendment, but the new announcement means party activists will actively campaign against the measure. “Our platform declares that ‘We oppose having the government impose state-sponsored morality or values on people of good conscience with differing views,” chair Mark Jenkins said in a statement