Historically a city of French Canadian immigrants, Lewiston, Maine is now also home to some 6,000 Somalis, including shop owner and father of five Mohamed Heban, who moved to Lewiston in 2002. But in a recent BBC documentary, Lewiston's mayor, Boston native Bob Macdonald, sounded less than welcoming. "When you come here, you accept our culture and leave your culture at the door," he said in the documentary...