Former District of Columbia Mayor Vincent Gray, whose sole term in office was dogged by a federal investigation that ended with no charges filed against him, began his political comeback on Thursday, announcing that he will run for the D.C. Council. Gray, a 73-year-old Democrat, lost his re-election bid in the 2014 Democratic primary to current Mayor Muriel Bowser. Three weeks before the primary, a federal prosecutor said in court that Gray knew about an illegal, $660,000 slush fund that helped him get elected in 2010. Last December, prosecutors said they decided not to charge him. Gray has maintained he...