After a tumultuous four years overseeing a city long riddled with blight, corruption, crime, and historic financial issues, mayor David Bing has had enough, telling a stunned audience at the Charles H. Wright Museum of African-American History Tuesday that he’d leave when his term ends in December. The 69-year-old Bing, a hall-of-fame NBA player who spent most of his career with the Pistons and then was a successful businessman in Detroit had never ran for office before narrowly winning the 2009 race to replace Kwame Kilpatrick, who in less than a term in office had gone from rising Democratic star...