The Brady Campaign to Prevent Gun Violence has sued the Interior Department to stop it from eliminating a 25-year-old federal rule restricting loaded guns in national parks. AP WASHINGTON -- An anti-gun group is suing to stop a last-second Bush administration change that would allow Americans to carry concealed, loaded guns in most national parks and wildlife refuges. The Brady Campaign to Prevent Gun Violence sued the Interior Department in federal court on Tuesday. They want a federal judge to stop the elimination of a 25-year-old federal rule severely restricting loaded guns in national parks...