AP: After a two-month shutdown, oil flowed Monday through a pipeline that leaked more than 800,000 gallons of oil in southern Michigan this summer, with some of it polluting a major river. Enbridge Inc. confirmed the gradual restart of the pipeline running between Griffith, Ind., and Sarnia, Ontario, was under way in a short statement released Monday evening. The pipeline had been shut down since the company reported a massive oil leak July 26. An estimated 820,000 to 1 million gallons …