Detroit Free Press: he U.S. State Department has extended the public comment period on a controversial proposal to expand a Canadian tar sands oil pipeline to the western shores of Lake Superior. Respondents now have until midnight Monday to weigh in on Canadian oil transport giant Enbridge Energys plan to expand its Line 67 or Alberta Clipper pipeline. The comment period was originally slated to conclude April 29. As reported in the Free Press April 14, Enbridge is seeking federal approval to nearly double the...