In a potential breakthrough on an immigration overhaul, President Barack Obama has hinted that he would be open to a reform bill even if it lacked a special pathway to citizenship for the 11 million people here illegally. Obama reiterated his preference for a concrete route to citizenship. But he said he doesn’t want to “prejudge” what might land on his desk and would have to evaluate the implications of a process to allow people get legal status and then have the option to become citizens.