In less than a month, Mayor Norm Coleman's plan to build a new Twins ballpark in downtown St. Paul will face a crucial test at the polls. If St. Paul voters approve a new sales tax to fund the stadium, the debate will move to a leery state legislature. Even if the referendum fails, the discussion isn't necessarily over. In the fourth and final part of our stadium series, Minnesota Public Radio's Michael Khoo examines what happens after the vote.