The nonprofit Oregon Sports Authority has officially launched a campaign to build the Portland Beavers a new stadium in Beaverton — a decision that surely has nothing to do with Beavers owner Merritt Paulson’s presence on the OSA board of directors. Only one problem: No one knows how it would be paid for. Oh, and Paulson says the proposed site might be big enough. And local landowners are threatening “war” if the city tries to take their property for use for a stadium. So, okay, three problems.