The lone white candidate in the race for the Massachusetts 12th Suffolk House seat — a district made up of 70% Black residents — is dropping out in the wake of the national civil rights movement that was sparked by the police killing of George Floyd. Cam Charbonnier, a longtime aide for Boston Mayor Marty Walsh, cited this “inspiring” movement in his decision to leave the race as he wrote in a letter on Thursday, “I realize that this is not my moment.” “… It has become clear to me that at this time and in this district, I may...