Democrats in the Minnesota House want a constitutional amendment on the ballot this fall to close what they say is a loophole in the state’s campaign finance law. House Minority Leader Paul Thissen says certain groups do not have to report what they’ve spent on any “issue-based” communication with voters, even if it supports or opposes a candidate close to the election. Thissen says the proposed constitutional amendment will let voters decide whether they have a right to know who’s spending money to influence their vote, and how much is being spent. Thissen says House Republicans blocked legislation last year. GOP leaders are not immediately available for comment.