Chicago Tribune: The threat to cut off government loans and bring on bankruptcy has given President Barack Obama tremendous leverage to reinvent the flagging U.S. auto industry to match his vision of Detroit as the future world leader in cleaner, greener cars. But for Obama’s plan to succeed, it will have to overcome obstacles that are often passed over in the current debate on the future of domestic carmakers. Even if the president succeeds in getting domestic carmakers onto firmer ground …